diff --git a/CMakeLists.txt b/CMakeLists.txt
index 4cb661faf996bc32424f88103f238088efd08520..7991e15cbb19726fba9881bd3061de9efdc5d215 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -30,7 +30,7 @@ find_package(Threads REQUIRED)
 find_package(CUDA QUIET)
 
 include(simd)
-
+SET(CMAKE_BUILD_TYPE "Debug")
 # CMAKE_BUILD_TYPE
 if(NOT CMAKE_BUILD_TYPE)
     set(CMAKE_BUILD_TYPE "RelWithDebInfo" CACHE STRING
diff --git a/core/configure/proto/server_configure.proto b/core/configure/proto/server_configure.proto
index 24fb62806476effdcf453cb7b4047122731106ea..5cace06420e29e1590218f63777c85bbcf504b29 100755
--- a/core/configure/proto/server_configure.proto
+++ b/core/configure/proto/server_configure.proto
@@ -21,11 +21,12 @@ message EngineDesc {
   required string reloadable_meta = 3;
   required string reloadable_type = 4;
   required string model_dir = 5;
-  required int32 runtime_thread_num = 6;
-  required int32 batch_infer_size = 7;
-  required int32 enable_batch_align = 8;
-  optional string version_file = 9;
-  optional string version_type = 10;
+  repeated int32 gpu_ids = 6;
+  required int32 runtime_thread_num = 7;
+  required int32 batch_infer_size = 8;
+  required int32 enable_batch_align = 9;
+  optional string version_file = 10;
+  optional string version_type = 11;
 
   /*
    * Sparse Parameter Service type. Valid types are:
@@ -38,16 +39,17 @@ message EngineDesc {
     LOCAL = 1;
     REMOTE = 2;
   }
-  optional SparseParamServiceType sparse_param_service_type = 11;
-  optional string sparse_param_service_table_name = 12;
-  optional bool enable_memory_optimization = 13;
-  optional bool enable_ir_optimization = 14;
-  optional bool use_trt = 15;
-  optional bool use_lite = 16;
-  optional bool use_xpu = 17;
-  optional bool use_gpu = 18;
-  optional bool combined_model = 19;
-  optional bool encrypted_model = 20;
+  optional SparseParamServiceType sparse_param_service_type = 12;
+  optional string sparse_param_service_table_name = 13;
+  optional bool enable_memory_optimization = 14;
+  optional bool enable_ir_optimization = 15;
+  optional bool use_trt = 16;
+  optional bool use_lite = 17;
+  optional bool use_xpu = 18;
+  optional bool use_gpu = 19;
+  optional bool combined_model = 20;
+  optional bool encrypted_model = 21;
+  optional bool gpu_multi_stream = 22;
 };
 
 // model_toolkit conf
diff --git a/core/general-client/src/general_model.cpp b/core/general-client/src/general_model.cpp
old mode 100644
new mode 100755
index 0ade573de6ac2da59156ba82f5ff3e04f1b7f6b2..d3dd5d9f7c72abd921c7fdf055e9f02293dfab43
--- a/core/general-client/src/general_model.cpp
+++ b/core/general-client/src/general_model.cpp
@@ -166,6 +166,8 @@ int PredictorClient::numpy_predict(
   batch_size = batch_size > string_feed_batch.size() ? batch_size
                                                      : string_feed_batch.size();
   VLOG(2) << "batch size: " << batch_size;
+  // batch_size must be 1, cause batch is already in Tensor.
+  // I suggest to remove the outside vector<>.
   predict_res_batch.clear();
   Timer timeline;
   int64_t preprocess_start = timeline.TimeStampUS();
@@ -188,6 +190,8 @@ int PredictorClient::numpy_predict(
   }
 
   int vec_idx = 0;
+  // batch_size can only be 1, cause batch is already in Tensor.
+  // if batch_size is not 1, error will occur in C++ part.
   for (int bi = 0; bi < batch_size; bi++) {
     VLOG(2) << "prepare batch " << bi;
     std::vector<Tensor *> tensor_vec;
diff --git a/core/general-server/op/general_reader_op.cpp b/core/general-server/op/general_reader_op.cpp
old mode 100644
new mode 100755
index 3e1091dd844f0afd71c8556586f82aafc42c5097..1c40e89b86a5b28543c3a49240316401a46ea639
--- a/core/general-server/op/general_reader_op.cpp
+++ b/core/general-server/op/general_reader_op.cpp
@@ -93,6 +93,9 @@ int GeneralReaderOp::inference() {
   res->SetLogId(log_id);
   Timer timeline;
   int64_t start = timeline.TimeStampUS();
+  // only get insts(0), cause batch is already in Tensor.
+  // req can only include 1 inst.
+  // var_num means the number of feed_var.
   int var_num = req->insts(0).tensor_array_size();
 
   VLOG(2) << "(logid=" << log_id << ") var num: " << var_num
diff --git a/core/predictor/framework/bsf-inl-tensor.h b/core/predictor/framework/bsf-inl-tensor.h
deleted file mode 100644
index b7c725b443281f355addffb8f2fcb36651b6d9b6..0000000000000000000000000000000000000000
--- a/core/predictor/framework/bsf-inl-tensor.h
+++ /dev/null
@@ -1,373 +0,0 @@
-// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-#pragma once
-
-#ifdef BCLOUD
-#include <base/atomicops.h>
-#else
-#include <butil/atomicops.h>
-#endif
-
-#include <errno.h>
-#include <algorithm>
-#include <deque>
-#include <vector>
-#include "core/predictor/common/inner_common.h"
-#include "core/predictor/framework/infer_data.h"
-#include "core/predictor/framework/memory.h"
-
-#include <boost/function.hpp>
-
-namespace im {
-namespace bsf {
-
-template <>
-struct Task<baidu::paddle_serving::predictor::Tensor,
-            baidu::paddle_serving::predictor::Tensor> {
-  typedef Task<baidu::paddle_serving::predictor::Tensor,
-               baidu::paddle_serving::predictor::Tensor>
-      TaskT;
-  typedef baidu::paddle_serving::predictor::Tensor Tensor;
-  typedef baidu::paddle_serving::predictor::Tensor InType;
-  typedef baidu::paddle_serving::predictor::Tensor OutType;
-  typedef baidu::paddle_serving::predictor::BatchTensor BatchTensor;
-  typedef baidu::paddle_serving::predictor::BatchTensor InArrayT;
-  typedef baidu::paddle_serving::predictor::BatchTensor OutArrayT;
-
-  struct Segment {
-    Segment(void* p, size_t b, size_t s) : ptr(p), begin(b), size(s) {}
-    void* ptr;
-    size_t begin;
-    size_t size;
-  };
-
-  int read_fd;
-  int write_fd;
-
-  pid_t owner_tid;
-
-  const InArrayT* in;
-  OutArrayT* out;
-
-  size_t rem;
-  size_t size;
-
-  butil::atomic<size_t> index;
-
-  const BatchTensor* get(bool is_in) const {
-    if (is_in) {
-      return in;
-    } else {
-      return out;
-    }
-  }
-
-  BatchTensor* get(bool is_in) {
-    if (is_in) {
-      return const_cast<BatchTensor*>(in);
-    } else {
-      return out;
-    }
-  }
-
-  Task() {
-    read_fd = -1;
-    write_fd = -1;
-    owner_tid = -1;
-    in = NULL;
-    out = NULL;
-    rem = -1;
-    size = -1;
-    index.store(0, butil::memory_order_relaxed);
-  }
-};
-
-template <>
-class BatchTasks<Task<baidu::paddle_serving::predictor::Tensor,
-                      baidu::paddle_serving::predictor::Tensor>> {
- public:
-  typedef baidu::paddle_serving::predictor::Tensor Tensor;
-  typedef baidu::paddle_serving::predictor::Tensor InType;
-  typedef baidu::paddle_serving::predictor::Tensor OutType;
-  typedef baidu::paddle_serving::predictor::DataBuf DataBuf;
-  typedef baidu::paddle_serving::predictor::MempoolWrapper MempoolWrapper;
-
-  typedef Task<baidu::paddle_serving::predictor::Tensor,
-               baidu::paddle_serving::predictor::Tensor>
-      TaskT;
-  typedef TaskMeta<TaskT> TaskMetaT;
-  typedef TaskT::InArrayT InArrayT;
-  typedef TaskT::OutArrayT OutArrayT;
-
-  explicit BatchTasks(size_t batch_size, bool batch_align = false)
-      : _batch_size(batch_size),
-        _rem_size(batch_size),
-        _batch_align(batch_align) {
-    _batch_in.clear();
-    _batch_out.clear();
-    _tasks.clear();
-  }
-
-  ~BatchTasks() {
-    _batch_in.clear();
-    _batch_out.clear();
-    _tasks.clear();
-  }
-
-  static bool check_valid(const InArrayT& in,
-                          OutArrayT& out,  // NOLINT
-                          bool align) {    // NOLINT
-    if (align) {
-      if (out.count() <= 0 || out.size() <= 0) {
-        LOG(ERROR) << "Out tensor is empty, when aligned";
-        return false;
-      }
-
-      if (out.size() != in.size()) {
-        LOG(ERROR) << "In/Out tensor size not eq: " << out.size()
-                   << "!=" << in.size();
-        return false;
-      }
-
-      for (size_t fi = 0, shape0 = 0; fi < out.count(); ++fi) {
-        if (!out[fi].valid()) {
-          LOG(ERROR) << "Out[" << fi << "] tensor not valid";
-          return false;
-        }
-
-        if (out.size() != out[fi].shape0()) {
-          LOG(ERROR) << "Shape0 not consistency, " << out.size()
-                     << "!=" << out[fi].shape0() << ", " << fi;
-          return false;
-        }
-      }
-    }
-
-    return true;
-  }
-
-  size_t append_task(TaskT* task) {
-    size_t add = std::min(task->rem, _rem_size);
-    if (!_batch_align) {
-      add = task->rem;
-    }
-    TaskMetaT tm(task, task->in->size() - task->rem, add);
-    _tasks.push_back(tm);
-
-    task->rem -= add;
-    _rem_size -= add;
-    return _rem_size;
-  }
-
-  void merge_tasks() {
-    merge_input();
-    merge_output();
-  }
-
-  void merge_input() {
-    if (_tasks.size() <= 0 || _tasks[0].task->in->count() <= 0) {
-      return;
-    }
-
-    if (_tasks.size() == 1 && !_batch_align) {
-      TaskMetaT& tm = _tasks[0];
-      _batch_in = *(tm.task->in);
-      return;
-    }
-
-    merge_tensor(true);
-  }
-
-  void merge_output() {
-    if (_batch_align) {
-      if (_tasks.size() <= 0 || _tasks[0].task->out->count() <= 0) {
-        return;
-      }
-    }
-
-    if (_tasks.size() <= 0 || _tasks[0].task->out->count() <= 0) {
-      return;
-    }
-
-    TaskMetaT& tm = _tasks[0];
-    if (_tasks.size() == 1 && !_batch_align) {
-      _batch_out = *(tm.task->out);
-      return;
-    }
-
-    if (tm.task->out->size() <= 0) {
-      // shape is empty
-      _batch_out = *(tm.task->out);
-      return;
-    }
-
-    if ((*tm.task->out)[0].data.data() == 0 ||
-        (*tm.task->out)[0].data.size() == 0) {
-      _batch_out = *(tm.task->out);
-      return;
-    }
-
-    merge_tensor(false);
-  }
-
-  void merge_tensor(bool is_in) {
-    // accumulate batch size from fetched tasks
-    size_t batch_size = 0;
-    for (size_t ti = 0; ti < _tasks.size(); ++ti) {
-      TaskMetaT& tm = _tasks[ti];
-      size_t add = tm.end - tm.begin;
-      batch_size += add;
-    }
-
-    // merge all instanses in each tensor data
-    size_t tensor_count = _tasks[0].task->get(is_in)->count();
-    for (size_t fi = 0; fi < tensor_count; ++fi) {
-      const Tensor& head = (*(_tasks[0].task->get(is_in)))[fi];
-      Tensor batch_tensor;
-      batch_tensor.name = head.name;
-      batch_tensor.type = head.type;
-      batch_tensor.shape.push_back(batch_size);
-
-      size_t ins_ele_count = 1;
-      for (size_t si = 1; si < head.shape.size(); ++si) {
-        batch_tensor.shape.push_back(head.shape[si]);
-        ins_ele_count *= head.shape[si];
-      }
-
-      size_t tensor_ele_count = ins_ele_count * batch_size;
-      size_t ins_byte = ins_ele_count * head.ele_byte();
-
-      size_t tensor_byte = tensor_ele_count * head.ele_byte();
-      void* data_buf = MempoolWrapper::instance().malloc(tensor_byte);
-      if (!data_buf) {
-        LOG(ERROR) << "Malloc failed, size: " << tensor_byte;
-        return;
-      }
-
-      size_t data_byte = 0;
-      for (size_t ti = 0; ti < _tasks.size(); ++ti) {
-        TaskMetaT& tm = _tasks[ti];
-        size_t acc_byte = ins_byte * (tm.end - tm.begin);
-        if (data_byte + acc_byte > tensor_byte) {
-          LOG(ERROR) << "Invalid bytes: " << data_byte << " + " << acc_byte
-                     << " >= " << tensor_byte;
-          return;
-        }
-
-        const Tensor& tensor = (*(tm.task->get(is_in)))[fi];
-        memcpy(
-            reinterpret_cast<char*>(data_buf) + data_byte,
-            reinterpret_cast<char*>(tensor.data.data()) + tm.begin * ins_byte,
-            acc_byte);
-        data_byte += acc_byte;
-      }
-
-      if (data_byte != tensor_byte) {
-        LOG(ERROR) << "Invalid tensor byte: " << data_byte
-                   << " != " << tensor_byte;
-        return;
-      }
-
-      batch_tensor.data =
-          DataBuf(reinterpret_cast<char*>(data_buf), tensor_byte);
-      if (is_in) {
-        _batch_in.push_back(batch_tensor);
-      } else {
-        _batch_out.push_back(batch_tensor);
-      }
-    }
-
-    LOG(INFO) << "merge input(" << is_in << ") samples: " << batch_size
-              << " from " << _tasks.size() << " pvs";
-  }
-
-  void notify_tasks() {
-    if (_batch_out.size() != _batch_in.size()) {
-      LOG(ERROR) << "batch size not consistency: " << _batch_out.size()
-                 << " != " << _batch_in.size();
-      return;
-    }
-
-    size_t tensor_count = _batch_out.count();
-    size_t batch_size = _batch_out.size();
-    for (size_t fi = 0; fi < tensor_count; ++fi) {
-      const Tensor& tensor = _batch_out[fi];
-      size_t ins_byte = tensor.ele_byte();
-      for (size_t si = 1; si < tensor.shape.size(); ++si) {
-        ins_byte *= tensor.shape[si];
-      }
-
-      for (size_t ti = 0, bi = 0, add = 0; ti < _tasks.size();
-           ++ti, bi += add) {
-        OutArrayT* dst = _tasks[ti].task->out;
-        add = _tasks[ti].end - _tasks[ti].begin;
-        size_t offset_src = ins_byte * bi;
-        size_t add_byte = add * ins_byte;
-
-        if (_batch_align) {  // merge all batchs
-          size_t offset_dst = ins_byte * _tasks[ti].begin;
-          void* ptr = const_cast<void*>((*dst)[fi].data.data());
-          memcpy(
-              reinterpret_cast<char*>(ptr) + offset_dst,
-              reinterpret_cast<char*>(_batch_out[fi].data.data()) + offset_src,
-              add_byte);
-        } else {  // overwrite
-          if (dst->count() <= 0) {
-            dst->push_back(_batch_out[fi]);
-          } else {
-            (*dst)[fi] = _batch_out[fi];
-          }
-
-          (*dst)[fi].shape[0] = add;
-          (*dst)[fi].data = DataBuf(
-              reinterpret_cast<char*>(_batch_out[fi].data.data()) + offset_src,
-              add_byte);
-        }
-      }
-    }
-
-    for (size_t ti = 0; ti < _tasks.size(); ++ti) {
-      TaskT* task = _tasks[ti].task;
-      size_t begin = _tasks[ti].begin;
-      size_t end = _tasks[ti].end;
-      size_t add = end - begin;
-
-      size_t index = task->index.fetch_add(add);
-      if ((index + add) >= task->in->size()) {
-        char c = 0;
-        while (write(task->write_fd, &c, 1) != 1 && errno == EINTR) {
-        }
-        butil::return_object(task);
-      }
-    }
-  }
-
-  const typename TaskT::InArrayT& in() const { return _batch_in; }
-
-  typename TaskT::OutArrayT& out() { return _batch_out; }
-
-  size_t task_size() { return _tasks.size(); }
-
- private:
-  std::vector<TaskMetaT> _tasks;
-  InArrayT _batch_in;
-  OutArrayT _batch_out;
-  size_t _batch_size;
-  size_t _rem_size;
-  bool _batch_align;
-};
-
-}  // namespace bsf
-}  // namespace im
diff --git a/core/predictor/framework/bsf-inl.h b/core/predictor/framework/bsf-inl.h
index 1193ce4860e595598b738adab738c7af9664cc26..22128d53e20c926ba982c13c9a8e8dcc34216907 100644
--- a/core/predictor/framework/bsf-inl.h
+++ b/core/predictor/framework/bsf-inl.h
@@ -24,6 +24,7 @@
 #include <boost/bind.hpp>
 
 #include "core/predictor/common/inner_common.h"
+#include "core/predictor/framework/memory.h"
 
 namespace im {
 namespace bsf {
@@ -125,18 +126,21 @@ void TaskExecutor<TaskT>::stop() {
 }
 
 template <typename TaskT>
-TaskHandler<TaskT> TaskExecutor<TaskT>::schedule(const InArrayT& in,
-                                                 OutArrayT& out) {  // NOLINT
+TaskHandler<TaskT> TaskExecutor<TaskT>::schedule(
+    const void* inVectorT_ptr,
+    void* outVectorT_ptr) {  // NOLINT
   TaskT* task = butil::get_object<TaskT>();
   if (!task) {
     LOG(ERROR) << "Failed get TaskT from object pool";
     return TaskHandler<TaskT>::valid_handle();
   }
 
+  /*
   if (!BatchTasks<TaskT>::check_valid(in, out, _batch_align)) {
     LOG(ERROR) << "Invalid input & output";
     return TaskHandler<TaskT>::valid_handle();
   }
+  */
 
   int fds[2];
   int rc = pipe(fds);
@@ -150,10 +154,9 @@ TaskHandler<TaskT> TaskExecutor<TaskT>::schedule(const InArrayT& in,
   task->write_fd = fds[1];
   task->owner_tid = ::syscall(SYS_gettid);
 
-  task->in = &in;
-  task->out = &out;
-  task->rem = in.size();
-  task->size = in.size();
+  task->inVectorT_ptr = (const InVectorT*)inVectorT_ptr;
+  task->outVectorT_ptr = (OutVectorT*)outVectorT_ptr;
+  task->rem = task->batch_size();
   task->index.store(0, butil::memory_order_relaxed);
 
   AutoMutex lock(_mut);
@@ -163,8 +166,13 @@ TaskHandler<TaskT> TaskExecutor<TaskT>::schedule(const InArrayT& in,
   return TaskHandler<TaskT>(*task);
 }
 
+// this function is accessed by multi thread.
+// so AutoMutex at first.
+// so batch.append_task is thread safe.
+// you dont need to add extra lock in append_task()
 template <typename TaskT>
-bool TaskExecutor<TaskT>::fetch_batch(BatchTasks<TaskT>& batch) {  // NOLINT
+bool TaskExecutor<TaskT>::move_task_to_batch(
+    BatchTasks<TaskT>& batch) {  // NOLINT
   AutoMutex lock(_mut);
   while (_task_queue.empty()) {
     THREAD_COND_WAIT(&_cond, &_mut);
@@ -187,8 +195,30 @@ bool TaskExecutor<TaskT>::fetch_batch(BatchTasks<TaskT>& batch) {  // NOLINT
   return true;
 }
 
+// this function is accessed by multi thread.
+// move_task_to_batch have add lock inside the function.
+// Packaging 1 TaskT as 1 or Several TaskMeta.
+// TaskT is from the SingleTon TaskExecutor`s _task_queue
+// although TaskMeta is a local variable, but several TaskMeta may points to
+// the same TaskT which is get from the SingleTon TaskExecutor`s _task_queue.
+// put TaskMeta to the local variable BatchTasks<TaskT> batch.
+
+// batch.merge_tasks() and batch.notify_tasks() has no lock.
+// BatchTasks<TaskT> batch itself is a local variable, it`s thread safe.
+// If batch.merge_tasks() and batch.notify_tasks() do something to TaskMeta
+// you need to pay attention to that.
+// Multi-Thread deal with different TaskMeta(cause it`s created as local
+// variable)
+// But different TaskMeta may points to the same TaskT
+// which is get from the SingleTon TaskExecutor`s _task_queue.
+
 template <typename TaskT>
 int TaskExecutor<TaskT>::work(ThreadContext<TaskT>* context) {
+  if (MempoolWrapper::instance().thread_initialize() != 0) {
+    LOG(ERROR) << "Failed thread initialize mempool";
+    return -1;
+  }
+
   if (_thread_init_fn != NULL) {
     if (_thread_init_fn(context->user_thread_context) != 0) {
       LOG(ERROR) << "execute thread init thunk failed, BSF thread will exit";
@@ -207,10 +237,15 @@ int TaskExecutor<TaskT>::work(ThreadContext<TaskT>* context) {
       }
     }
 
+    if (MempoolWrapper::instance().thread_clear() != 0) {
+      LOG(ERROR) << "Failed thread clear mempool";
+      return -1;
+    }
+
     BatchTasks<TaskT> batch(_batch_size, _batch_align);
-    if (fetch_batch(batch)) {
+    if (move_task_to_batch(batch)) {
       batch.merge_tasks();
-      _fn(batch.in(), batch.out());
+      _fn(&batch.in(), &batch.out());
       batch.notify_tasks();
     }
   }
@@ -219,8 +254,8 @@ int TaskExecutor<TaskT>::work(ThreadContext<TaskT>* context) {
 }
 
 template <typename InItemT, typename OutItemT>
-bool TaskManager<InItemT, OutItemT>::schedule(const InArrayT& in,
-                                              OutArrayT& out) {  // NOLINT
+bool TaskManager<InItemT, OutItemT>::schedule(const void* in,
+                                              void* out) {  // NOLINT
   TaskHandler<TaskT> handler = _executor.schedule(in, out);
 
   if (handler.valid()) {
diff --git a/core/predictor/framework/bsf.h b/core/predictor/framework/bsf.h
old mode 100644
new mode 100755
index 36a00c381130c191de713e5024c7247d64cb96e7..ee5ad61533fd7ca382aa466cb3f95b2a4ed6e228
--- a/core/predictor/framework/bsf.h
+++ b/core/predictor/framework/bsf.h
@@ -29,46 +29,184 @@
 
 #include "boost/function.hpp"
 
+#include "core/predictor/framework/memory.h"
+#include "paddle_inference_api.h"
+
 namespace im {
 namespace bsf {
 
 static const size_t DEFAULT_BATCH_SIZE = 100;
 
+// InItemT is paddle::PaddleTensor
+// InVectorT std::vector<paddle::PaddleTensor>
+// InVectorT means different feedvar, but not batch.
+// Batch is already inside the  paddle::PaddleTensor.
+
+// size_t `rem` records how many batch have not been put in BatchTasks.
+// `rem` don`t need to be atomic, cause the operation `put` is synchronous.
+// actually, the reason is that lock have been added outside the operation
+// `put`.
+
+// size_t `index` records how many batch have been processing completed.
+// `index` need to be atomic, cause the operation 'notify' is asynchronous.
 template <typename InItemT, typename OutItemT>
 struct Task {
-  typedef std::vector<InItemT> InArrayT;
-  typedef std::vector<OutItemT> OutArrayT;
+  typedef std::vector<InItemT> InVectorT;
+  typedef std::vector<OutItemT> OutVectorT;
   typedef InItemT InType;
   typedef OutItemT OutType;
   typedef Task<InItemT, OutItemT> TaskT;
+  typedef std::vector<int> ShapeVector;
+  typedef std::vector<ShapeVector> VectorOfShapeVector;
 
   int read_fd;
   int write_fd;
-
   pid_t owner_tid;
-
-  const InArrayT* in;
-  OutArrayT* out;
-
+  const InVectorT* inVectorT_ptr;
+  OutVectorT* outVectorT_ptr;
   size_t rem;
-  size_t size;
-
-  size_t batch_size() { return in->size(); }
-
   butil::atomic<size_t> index;
 
   Task() {
     read_fd = -1;
     write_fd = -1;
     owner_tid = -1;
-    in = NULL;
-    out = NULL;
+    inVectorT_ptr = NULL;
+    outVectorT_ptr = NULL;
     rem = -1;
-    size = -1;
     index.store(0, butil::memory_order_relaxed);
   }
+
+  bool check_feedvar_valid(int feedvar_index) {
+    if (feedvar_index < 0 || inVectorT_ptr->size() <= feedvar_index) {
+      LOG(ERROR) << "feedvar doesnt exsit or feedvar_index error";
+      return 0;
+    }
+
+    if ((*inVectorT_ptr)[feedvar_index].shape.size() <= 0) {
+      LOG(ERROR) << "feedvar[" << feedvar_index << "].shape.size()<=0,error";
+      return 0;
+    }
+
+    return 1;
+  }
+
+  // Now, it simply assume that the first dimension of data is batch.
+  // so the batch is PaddleTensor.shape[0]
+
+  // If batch information is added into feedvar.prototxt.
+  // we can get the information from the feedvar.prototxt instead of assume.
+  size_t feedvar_batch_size(int feedvar_index) {
+    if (!check_feedvar_valid(feedvar_index)) {
+      return 0;
+    }
+
+    return (*inVectorT_ptr)[feedvar_index].shape[0];
+  }
+
+  size_t feedvar_element_bytesize(int feedvar_index) {
+    if (!check_feedvar_valid(feedvar_index)) {
+      return 0;
+    }
+    int dtype = (*inVectorT_ptr)[feedvar_index].dtype;
+    if (dtype == paddle::PaddleDType::INT64) {
+      return sizeof(int64_t);
+    }
+    if (dtype == paddle::PaddleDType::FLOAT32) {
+      return sizeof(float);
+    }
+    if (dtype == paddle::PaddleDType::INT32) {
+      return sizeof(int32_t);
+    }
+    if (dtype == paddle::PaddleDType::UINT8) {
+      return sizeof(char);
+    }
+    return 0;
+  }
+
+  // Now, the implementation of this function is based on assumption
+  // that shape [0] = batch_size.
+  size_t feedvar_element_num(int feedvar_index) {
+    if (!check_feedvar_valid(feedvar_index)) {
+      return 0;
+    }
+    int element_num = 1;
+    if ((*inVectorT_ptr)[feedvar_index].shape.size() == 1) {
+      // cause shape[0] is batch_size.
+      return 1;
+    }
+    // start from shape[1], cause shape[0] = batch_size.
+    for (int i = 1; i < (*inVectorT_ptr)[feedvar_index].shape.size(); ++i) {
+      element_num *= (*inVectorT_ptr)[feedvar_index].shape[i];
+    }
+    return element_num;
+  }
+
+  size_t feedvar_bytesize(int feedvar_index) {
+    return feedvar_element_num(feedvar_index) *
+           feedvar_element_bytesize(feedvar_index);
+  }
+
+  ShapeVector feedvar_shape_nobatch(int feedvar_index) {
+    if (!check_feedvar_valid(feedvar_index)) {
+      return ShapeVector();
+    }
+    return ShapeVector{(*inVectorT_ptr)[feedvar_index].shape.begin() + 1,
+                       (*inVectorT_ptr)[feedvar_index].shape.end()};
+  }
+
+  VectorOfShapeVector feedvar_shape_nobatch() {
+    VectorOfShapeVector vector_of_feedvar_shape_nobatch(inVectorT_ptr->size());
+    for (int index = 0; index < inVectorT_ptr->size(); ++index) {
+      vector_of_feedvar_shape_nobatch.push_back(feedvar_shape_nobatch(index));
+    }
+    return vector_of_feedvar_shape_nobatch;
+  }
+
+  // At present, it is considered that the batch of all feedvar is consistent.
+  // so for each feedvar, PaddleTensor.shape[0] should be the same.
+  bool check_batch_align() {
+    int batch_size_align = feedvar_batch_size(0);
+    for (int feedvar_index = 0; feedvar_index < inVectorT_ptr->size();
+         ++feedvar_index) {
+      if (feedvar_batch_size(feedvar_index) != batch_size_align) {
+        return 0;
+      }
+    }
+    /*
+    for(int fetchvar_index = 0; fetchvar_index < outVectorT_ptr->size();
+    ++fetchvar_index) {
+      if(fetchvar_batch_size(fetchvar_index) != batch_size_align) {
+        return 0;
+      }
+    }
+    */
+    return 1;
+  }
+
+  size_t batch_size() {
+    if (check_batch_align()) {
+      return feedvar_batch_size(0);
+    }
+    return 0;
+  }
 };
 
+// `Several Task` or `part of batch in Task` can be a TaskMeta.
+// Task is the original Request from User.
+// For example, the batch of Task is 30. There are 4 Requests.
+// The batch of BatchTasks is 100, which means we can deal 100 batch 1 time.
+// TaskMeta-1:{task-1,0,30} TaskMeta-2:{task-2,0,30} TaskMeta-3:{task-3,0,30}
+// but the last Task will be divided to 2 TaskMeta.
+// TaskMeta-4:{task-4,0,10} TaskMeta-5:{task-4,10,30}.
+// TaskMeta-1 ~ TaskMeta-4 will be inside BatchTasks-1.
+// TaskMeta-5 will be inside BatchTasks-2.
+
+// TaskMeta is necessary.
+// cause we need know the the corresponding relationship between
+// `batch_out`(which is in BatchTasks) and `outVectorT_ptr`(which is in Task).
+// especially when 1 Task be divided into several TaskMeta and be put into
+// several different BatchTasks.
 template <typename TaskT>
 struct TaskMeta {
   TaskMeta(TaskT* ptr, size_t start, size_t add)
@@ -79,6 +217,10 @@ struct TaskMeta {
   size_t end;
 };
 
+// each TaskT is already include batch in itself
+// BatchTasks need to combine several `small TaskMeta` into a new `big TaskT`.
+// The only difference between the `big TaskT` and `small TaskT` is that
+// the TaskT.inVectorT_ptr->[feedvar_index].shape[0] is different.
 template <typename TaskT>
 class BatchTasks {
  public:
@@ -91,33 +233,38 @@ class BatchTasks {
         _rem_size(batch_size),
         _batch_align(batch_align) {
     _batch_in.clear();
+    _batch_in_offset.clear();
     _batch_out.clear();
-    _tasks.clear();
+    _batch_out_offset.clear();
+    _taskmeta_vector.clear();
   }
 
   ~BatchTasks() {
     _batch_in.clear();
+    _batch_in_offset.clear();
     _batch_out.clear();
-    _tasks.clear();
+    _batch_out_offset.clear();
+    _taskmeta_vector.clear();
   }
 
   // synchronized operation
+  // because Upper level callers of this function have already locked.
   size_t append_task(TaskT* task) {
     size_t add = std::min(task->rem, _rem_size);
     if (!_batch_align) {
       add = task->rem;
     }
-
-    TaskMetaT tm(task, task->in->size() - task->rem, add);
-    _tasks.push_back(tm);
+    int start_index = task->batch_size() - task->rem;
+    TaskMetaT tm(task, start_index, add);
+    _taskmeta_vector.push_back(tm);
 
     task->rem -= add;
     _rem_size -= add;
     return _rem_size;
   }
 
-  static bool check_valid(const typename TaskT::InArrayT& in,
-                          const typename TaskT::OutArrayT& out,
+  static bool check_valid(const typename TaskT::InVectorT& in,
+                          const typename TaskT::OutVectorT& out,
                           bool align) {
     (void)in;
     (void)out;
@@ -125,40 +272,221 @@ class BatchTasks {
     return true;
   }
 
+  // this should be modified totally.
+  // maybe we don`t need to do this inside the BatchTasks.
+  // we can do the copy work outside the BatchTasks.
+  // cause maybe next time we don`t need to do the extra copy.
+  // directly copy the every Task into the Predictor.
+
+  // lod is not supported.
+  // if lod is set, we should not allow to use the bsf task.
+
+  // batch.merge_tasks() is thread-safe function
+  // cause batch is a local variable and Task is just read, not written.
   void merge_tasks() {
-    for (size_t ti = 0; ti < _tasks.size(); ++ti) {
-      TaskMetaT& tm = _tasks[ti];
-      for (size_t vi = tm.begin; vi < tm.end; ++vi) {
-        _batch_in.push_back((*tm.task->in)[vi]);
-        _batch_out.push_back((*tm.task->out)[vi]);
+    if (_taskmeta_vector.size() <= 0) {
+      return;
+    }
+
+    // Temporarily, the batch of each feedvar is consistent
+    // If not consistent, use feedvar_batch_size instead of task->batch_size().
+    int temp_batch = 0;
+    for (size_t ti = 0; ti < _taskmeta_vector.size(); ++ti) {
+      TaskMetaT& tm = _taskmeta_vector[ti];
+      temp_batch += tm.task->batch_size();
+    }
+    if (temp_batch > _batch_size) {
+      LOG(ERROR) << "_realNumber_batch_in >_batch_size, error.";
+      return;
+    }
+
+    int feedvar_num = _taskmeta_vector[0].task->inVectorT_ptr->size();
+    if (_batch_in_offset.size() == 0) {
+      _batch_in_offset.resize(feedvar_num, 0);
+      _realNumber_batch_in.resize(feedvar_num, temp_batch);
+    }
+
+    for (size_t ti = 0; ti < _taskmeta_vector.size(); ++ti) {
+      TaskMetaT& tm = _taskmeta_vector[ti];
+
+      for (int index = 0; index < feedvar_num; ++index) {
+        const paddle::PaddleTensor& feedVarTensor =
+            (*tm.task->inVectorT_ptr)[index];
+        int feedvar_bytesize = tm.task->feedvar_bytesize(index);
+
+        if (ti == 0) {
+          if (feedVarTensor.lod.size() > 0 && feedVarTensor.lod[0].size() > 0) {
+            LOG(ERROR) << "lod Tensor is not supported now.";
+            return;
+          }
+          // for now, we assume that every task feedvar_bytesize is the same.
+          // which means we dont support auto embedding.
+          // but for different feedvar, it is different.
+          paddle::PaddleTensor paddleTensor;
+          paddleTensor.dtype = feedVarTensor.dtype;
+          paddleTensor.name = feedVarTensor.name;
+          paddleTensor.lod = feedVarTensor.lod;
+          paddleTensor.shape = feedVarTensor.shape;
+          paddleTensor.shape[0] = _realNumber_batch_in[index];
+          paddleTensor.data.Resize(feedvar_bytesize *
+                                   _realNumber_batch_in[index]);
+          _batch_in.push_back(paddleTensor);
+        }
+
+        void* dst_ptr = _batch_in[index].data.data() +
+                        feedvar_bytesize * _batch_in_offset[index];
+        void* source_ptr =
+            feedVarTensor.data.data() + feedvar_bytesize * tm.begin;
+        int length = feedvar_bytesize * (tm.end - tm.begin);
+        memcpy(dst_ptr, source_ptr, length);
+        _batch_in_offset[index] += length;
       }
     }
   }
 
+  bool check_fetchvar_valid(int fetchvar_index) {
+    if (fetchvar_index < 0 || _batch_out.size() <= fetchvar_index) {
+      LOG(ERROR) << "fetchvar doesnt exsit or fetchvar_index error";
+      return 0;
+    }
+
+    if (_batch_out[fetchvar_index].shape.size() <= 0) {
+      LOG(ERROR) << "fetchvar[" << fetchvar_index << "].shape.size()<=0,error";
+      return 0;
+    }
+
+    return 1;
+  }
+
+  size_t fetchvar_batch_size(int fetchvar_index) {
+    if (!check_fetchvar_valid(fetchvar_index)) {
+      return 0;
+    }
+
+    return _batch_out[fetchvar_index].shape[0];
+  }
+
+  size_t fetchvar_element_bytesize(int fetchvar_index) {
+    if (!check_fetchvar_valid(fetchvar_index)) {
+      return 0;
+    }
+    int dtype = _batch_out[fetchvar_index].dtype;
+    if (dtype == paddle::PaddleDType::INT64) {
+      return sizeof(int64_t);
+    }
+    if (dtype == paddle::PaddleDType::FLOAT32) {
+      return sizeof(float);
+    }
+    if (dtype == paddle::PaddleDType::INT32) {
+      return sizeof(int32_t);
+    }
+    if (dtype == paddle::PaddleDType::UINT8) {
+      return sizeof(char);
+    }
+    return 0;
+  }
+
+  // Now, the implementation of this function is based on assumption
+  // that shape [0] = batch_size.
+  size_t fetchvar_element_num(int fetchvar_index) {
+    if (!check_fetchvar_valid(fetchvar_index)) {
+      return 0;
+    }
+    int element_num = 1;
+    if (_batch_out[fetchvar_index].shape.size() == 1) {
+      // cause shape[0] is batch_size.
+      return 1;
+    }
+    // start from shape[1], cause shape[0] = batch_size.
+    for (int i = 1; i < _batch_out[fetchvar_index].shape.size(); ++i) {
+      element_num *= _batch_out[fetchvar_index].shape[i];
+    }
+    return element_num;
+  }
+
+  size_t fetchvar_bytesize(int fetchvar_index) {
+    return fetchvar_element_num(fetchvar_index) *
+           fetchvar_element_bytesize(fetchvar_index);
+  }
+
+  bool check_fetchvar_batch_align() {
+    int batch_size_align = fetchvar_batch_size(0);
+
+    for (int fetchvar_index = 0; fetchvar_index < _batch_out.size();
+         ++fetchvar_index) {
+      if (fetchvar_batch_size(fetchvar_index) != batch_size_align) {
+        return 0;
+      }
+    }
+
+    return 1;
+  }
+
+  size_t fetchvar_batch_size() {
+    if (check_fetchvar_batch_align()) {
+      return fetchvar_batch_size(0);
+    }
+    return 0;
+  }
+
   void notify_tasks() {
-    if (_batch_out.size() != _batch_in.size()) {
-      LOG(ERROR) << "batch size not consistency: " << _batch_out.size()
-                 << " != " << _batch_in.size();
+    if (_taskmeta_vector.size() <= 0) {
+      LOG(ERROR) << "_taskmeta_vector.size() <=0, error.";
+      return;
+    }
+    if (_realNumber_batch_in[0] != fetchvar_batch_size()) {
+      LOG(ERROR) << "_batch_out`s batch != _batch_in`s batch, error.";
       return;
     }
 
-    for (size_t ti = 0, bi = 0; ti < _tasks.size(); ++ti) {
-      TaskT* task = _tasks[ti].task;
-      size_t begin = _tasks[ti].begin;
-      size_t end = _tasks[ti].end;
+    int fetchvar_num = _batch_out.size();
+    if (_batch_out_offset.size() == 0) {
+      _batch_out_offset.resize(fetchvar_num, 0);
+    }
+
+    for (size_t ti = 0; ti < _taskmeta_vector.size(); ++ti) {
+      TaskT* task = _taskmeta_vector[ti].task;
+      size_t begin = _taskmeta_vector[ti].begin;
+      size_t end = _taskmeta_vector[ti].end;
       size_t add = end - begin;
 
-      for (size_t oi = begin; oi < end; ++oi, ++bi) {
-        if (bi >= _batch_in.size()) {
-          LOG(ERROR) << "batch index overflow: " << bi << " > "
-                     << _batch_in.size();
+      for (int index = 0; index < fetchvar_num; ++index) {
+        // the task->outVectorT_ptr is null before core->run().
+        // first time we should copy from _batch_out
+        // so we need init.
+        int fetchvar_bytesize_index = fetchvar_bytesize(index);
+        if (task->outVectorT_ptr->size() <= index) {
+          paddle::PaddleTensor tensor_out;
+          tensor_out.name = _batch_out[index].name;
+          tensor_out.dtype = paddle::PaddleDType(_batch_out[index].dtype);
+          tensor_out.shape = _batch_out[index].shape;
+          tensor_out.shape[0] = task->batch_size();
+          tensor_out.lod = _batch_out[index].lod;
+          // resize all batch memory at one time
+          size_t databuf_size = task->batch_size() * fetchvar_bytesize_index;
+          tensor_out.data.Resize(databuf_size);
+          task->outVectorT_ptr->push_back(tensor_out);
+        }
+
+        paddle::PaddleTensor& fetchVarTensor = (*task->outVectorT_ptr)[index];
+
+        void* dst_ptr =
+            fetchVarTensor.data.data() + fetchvar_bytesize_index * begin;
+        int length = fetchvar_bytesize_index * add;
+        if (_batch_out_offset[index] + length >
+            fetchvar_batch_size() * fetchvar_bytesize(index)) {
+          LOG(ERROR) << "_batch_out is less than taskmeta, error.";
           return;
         }
-        (*task->out)[oi] = _batch_out[bi];
+        void* source_ptr =
+            _batch_out[index].data.data() + _batch_out_offset[index];
+
+        memcpy(dst_ptr, source_ptr, length);
+        _batch_out_offset[index] += length;
       }
 
       size_t index = task->index.fetch_add(add);
-      if ((index + add) >= task->in->size()) {
+      if ((index + add) >= task->batch_size()) {
         char c = 0;
         while (write(task->write_fd, &c, 1) != 1 && errno == EINTR) {
         }
@@ -167,16 +495,20 @@ class BatchTasks {
     }
   }
 
-  const typename TaskT::InArrayT& in() const { return _batch_in; }
+  const typename TaskT::InVectorT& in() const { return _batch_in; }
 
-  typename TaskT::OutArrayT& out() { return _batch_out; }
+  typename TaskT::OutVectorT& out() { return _batch_out; }
 
-  size_t task_size() { return _tasks.size(); }
+  size_t task_size() { return _taskmeta_vector.size(); }
 
  private:
-  std::vector<TaskMetaT> _tasks;
-  typename TaskT::InArrayT _batch_in;
-  typename TaskT::OutArrayT _batch_out;
+  std::vector<TaskMetaT> _taskmeta_vector;
+  typename TaskT::InVectorT _batch_in;
+  std::vector<int> _batch_in_offset;
+  std::vector<int> _realNumber_batch_in;
+  typename TaskT::OutVectorT _batch_out;
+  std::vector<int> _batch_out_offset;
+  std::vector<int> _realNumber_batch_out;
   size_t _rem_size;
   size_t _batch_size;
   bool _batch_align;
@@ -236,9 +568,10 @@ class TaskExecutor {
  public:
   typedef typename TaskT::InType InType;
   typedef typename TaskT::OutType OutType;
-  typedef typename TaskT::InArrayT InArrayT;
-  typedef typename TaskT::OutArrayT OutArrayT;
+  typedef typename TaskT::InVectorT InVectorT;
+  typedef typename TaskT::OutVectorT OutVectorT;
   typedef std::vector<TaskT> TaskArrayT;
+  typedef baidu::paddle_serving::predictor::MempoolWrapper MempoolWrapper;
 
   TaskExecutor()
       : _stop(false),
@@ -277,8 +610,7 @@ class TaskExecutor {
     _thread_reset_fn = reset_fn;
   }
 
-  void set_thread_callback_fn(
-      boost::function<void(const InArrayT&, OutArrayT&)> cb) {
+  void set_thread_callback_fn(boost::function<void(const void*, void*)> cb) {
     _fn = cb;
   }
 
@@ -293,9 +625,9 @@ class TaskExecutor {
 
   int work(ThreadContext<TaskT>* context);
 
-  TaskHandler<TaskT> schedule(const InArrayT&, OutArrayT&);
+  TaskHandler<TaskT> schedule(const void*, void*);
 
-  bool fetch_batch(BatchTasks<TaskT>& batch);  // NOLINT
+  bool move_task_to_batch(BatchTasks<TaskT>& batch);  // NOLINT
 
   bool _stop;
 
@@ -315,15 +647,15 @@ class TaskExecutor {
   size_t _batch_size;
   bool _batch_align;
 
-  boost::function<void(const InArrayT&, OutArrayT&)> _fn;
+  boost::function<void(const void*, void*)> _fn;
 };
 
 template <typename InItemT, typename OutItemT>
 class TaskManager {
  public:
   typedef Task<InItemT, OutItemT> TaskT;
-  typedef typename TaskT::InArrayT InArrayT;
-  typedef typename TaskT::OutArrayT OutArrayT;
+  typedef typename TaskT::InVectorT InVectorT;
+  typedef typename TaskT::OutVectorT OutVectorT;
 
   explicit TaskManager(TaskExecutor<TaskT>& exe, size_t batch_size)  // NOLINT
       : _executor(exe) {}
@@ -332,7 +664,7 @@ class TaskManager {
 
   ~TaskManager() { wait(); }
 
-  bool schedule(const InArrayT& in, OutArrayT& out);  // NOLINT
+  bool schedule(const void* in, void* out);  // NOLINT
   void wait();
 
   inline void clear() { wait(); }
@@ -357,5 +689,5 @@ class AutoMutex {
 }  // namespace bsf
 }  // namespace im
 
-#include "core/predictor/framework/bsf-inl-tensor.h"
+// #include "core/predictor/framework/bsf-inl-tensor.h"
 #include "core/predictor/framework/bsf-inl.h"
diff --git a/core/predictor/framework/infer.cpp b/core/predictor/framework/infer.cpp
old mode 100644
new mode 100755
index e11861426fe3c1c1cea39811d66bb4feffdd8b9e..9b84ea35ee8ab6dd0888c40aa557a9ebcd2ab623
--- a/core/predictor/framework/infer.cpp
+++ b/core/predictor/framework/infer.cpp
@@ -82,9 +82,9 @@ int ReloadableInferEngine::infer(const void* in,
     return infer_impl(in, out, batch_size);
   }
 
-  im::bsf::TaskManager<Tensor, Tensor> task_manager;
-  task_manager.schedule(*(reinterpret_cast<const BatchTensor*>(in)),
-                        *(reinterpret_cast<BatchTensor*>(out)));
+  im::bsf::TaskManager<paddle::PaddleTensor, paddle::PaddleTensor> task_manager;
+
+  task_manager.schedule(in, out);
   task_manager.wait();
   return 0;
 }
@@ -362,8 +362,8 @@ int VersionedInferEngine::infer_impl(const void* in,
                                      uint32_t batch_size) {
   return -1;
 }
-int VersionedInferEngine::task_infer_impl(const BatchTensor& in,
-                                          BatchTensor& out) {  // NOLINT
+int VersionedInferEngine::task_infer_impl(const void* in,
+                                          void* out) {  // NOLINT
   return -1;
 }
 
diff --git a/core/predictor/framework/infer.h b/core/predictor/framework/infer.h
index 6113dc8eff60814af62ad145a334db666629f080..e7785f40462af7a18775319737ecc808881cba79 100755
--- a/core/predictor/framework/infer.h
+++ b/core/predictor/framework/infer.h
@@ -21,10 +21,12 @@
 #include <string>
 #include <utility>
 #include <vector>
+#include <functional>
 #include "core/predictor/common/inner_common.h"
 #include "core/predictor/framework/bsf.h"
 #include "core/predictor/framework/factory.h"
 #include "core/predictor/framework/infer_data.h"
+#include "core/predictor/framework/memory.h"
 #include "paddle_inference_api.h"  // NOLINT
 namespace baidu {
 namespace paddle_serving {
@@ -86,8 +88,7 @@ class InferEngine {
   virtual int infer_impl(const void* in,
                          void* out,
                          uint32_t batch_size = -1) = 0;
-  virtual int task_infer_impl(const BatchTensor& in,
-                              BatchTensor& out) = 0;  // NOLINT
+  virtual int task_infer_impl(const void* in, void* out) = 0;  // NOLINT
 
   // end: framework inner call
 };
@@ -104,7 +105,7 @@ class ReloadableInferEngine : public InferEngine {
   };
 
   virtual int load(const configure::EngineDesc& conf) = 0;
-  typedef im::bsf::Task<Tensor, Tensor> TaskT;
+  typedef im::bsf::Task<paddle::PaddleTensor, paddle::PaddleTensor> TaskT;
 
   int proc_initialize_impl(const configure::EngineDesc& conf, bool version);
 
@@ -179,6 +180,8 @@ struct ModelData {
     delete cores[1];
   }
 
+  void* get() { return cores[current_idx]->get(); }
+
   EngineCore* cores[2];
   uint32_t current_idx;
 };
@@ -191,14 +194,20 @@ class DBReloadableInferEngine : public ReloadableInferEngine {
   int proc_initialize(const configure::EngineDesc& conf, bool version) {
     THREAD_KEY_CREATE(&_skey, NULL);
     THREAD_MUTEX_INIT(&_mutex, NULL);
+    gpu_index = 0;
     return ReloadableInferEngine::proc_initialize(conf, version);
   }
 
+  // 进程初始化会调用load，但由于未执行线程初始化，所以_reload_vec为空,不再继续执行。
+  // 热加载的话会调用load，由于线程已经初始化，_reload_vec不为空，所以继续执行load_data操作加载数据。
+  // 线程初始化会执行load_data操作加载数据，然后将engine加入_reload_vec中。
+  // 每个模型只有一个CloneDBReloadableInferEngine对象。
+  // 但一个CloneDBReloadableInferEngine对象，可以包含N个EngineCore。
   virtual int load(const configure::EngineDesc& conf) {
     if (_reload_vec.empty()) {
       return 0;
     }
-
+    gpu_index = 0;
     for (uint32_t ti = 0; ti < _reload_vec.size(); ++ti) {
       if (load_data(_reload_vec[ti], conf) != 0) {
         LOG(ERROR) << "Failed reload engine model: " << ti;
@@ -210,7 +219,8 @@ class DBReloadableInferEngine : public ReloadableInferEngine {
     return 0;
   }
 
-  int load_data(ModelData<EngineCore>* md, const configure::EngineDesc& conf) {
+  virtual int load_data(ModelData<EngineCore>* md,
+                        const configure::EngineDesc& conf) {
     uint32_t next_idx = (md->current_idx + 1) % 2;
     if (md->cores[next_idx]) {
       delete md->cores[next_idx];
@@ -219,28 +229,29 @@ class DBReloadableInferEngine : public ReloadableInferEngine {
     md->cores[next_idx] = new (std::nothrow) EngineCore;
 
     // params.dump();
-    if (!md->cores[next_idx] || md->cores[next_idx]->create(conf) != 0) {
+    size_t gpu_ids_num = conf.gpu_ids_size();
+    im::bsf::AutoMutex lock(_mutex);
+    int gpu_id = -1;
+    if (gpu_ids_num > 0) {
+      gpu_id = conf.gpu_ids(gpu_index % gpu_ids_num);
+    }
+    if (!md->cores[next_idx] ||
+        md->cores[next_idx]->create(conf, gpu_id) != 0) {
       LOG(ERROR) << "Failed create model, path: " << conf.model_dir();
       return -1;
     }
+    gpu_index++;
     md->current_idx = next_idx;
     return 0;
   }
 
   virtual int thrd_initialize_impl() {
-    // memory pool to be inited in non-serving-threads
-    if (MempoolWrapper::instance().thread_initialize() != 0) {
-      LOG(ERROR) << "Failed thread initialize mempool";
-      return -1;
-    }
-
     ModelData<EngineCore>* md = new (std::nothrow) ModelData<EngineCore>;
     if (!md || load_data(md, _conf) != 0) {
       LOG(ERROR) << "Failed create thread data from " << _conf.model_dir();
       return -1;
     }
 
-    LOG(ERROR) << "THREAD_SETSPECIFIC _skey = md";
     THREAD_SETSPECIFIC(_skey, md);
     im::bsf::AutoMutex lock(_mutex);
     _reload_vec.push_back(md);
@@ -248,11 +259,23 @@ class DBReloadableInferEngine : public ReloadableInferEngine {
   }
 
   int thrd_clear_impl() {
-    // for non-serving-threads
-    if (MempoolWrapper::instance().thread_clear() != 0) {
-      LOG(ERROR) << "Failed thread clear mempool";
-      return -1;
-    }
+    // for bsf-Task-threads
+    // actually, there are 2 kinds of multi-thread.
+    // 1. brpc thread 2. bsf Task thread
+    // each request is in 1-single brpc thread.
+    // IF (bsf Task thread is not used)
+    // every single brpc thread thread corresponds to all the EngineCores.
+    // each request runs all models in 1-single thread brpc thread.
+
+    // IF (bsf Task thread is used)
+    // there will be a ThreadPool called bsf TaskExecutor.
+    // in TaskExecutor, 1 bsf thread corresponds to 1 EngineCore.
+    // brpc thread only put the data into the task_queue(which is in
+    // TaskExecutor)
+    // EngineCore->infer() is running in bsf Task thread.
+
+    // MempoolWrapper::instance() is actually a Thread-Local Mempool.
+    // so it belongs to a single Thread.
     return 0;
   }
 
@@ -278,6 +301,7 @@ class DBReloadableInferEngine : public ReloadableInferEngine {
   THREAD_KEY_T _skey;
   THREAD_MUTEX_T _mutex;
   std::vector<ModelData<EngineCore>*> _reload_vec;
+  int gpu_index = 0;
 };
 
 // 多个EngineCore共用同一份模型数据
@@ -287,88 +311,69 @@ class CloneDBReloadableInferEngine
  public:
   virtual ~CloneDBReloadableInferEngine() {}
 
-  virtual int proc_initialize(const configure::EngineDesc& conf, bool version) {
-    _pd = new (std::nothrow) ModelData<EngineCore>;
-    if (!_pd) {
-      LOG(ERROR) << "Failed to allocate for ProcData";
-      return -1;
-    }
-    return DBReloadableInferEngine<EngineCore>::proc_initialize(conf, version);
-  }
+  // 进程初始化会调用load，但由于未执行线程初始化，所以_reload_vec为空,不再继续执行。
+  // 热加载的话会调用load，由于线程已经初始化，_reload_vec不为空，所以继续执行load_data操作加载数据。
+  // 线程初始化会执行load_data操作加载数据，然后将engine加入_reload_vec中。
+  // 每个模型只有一个CloneDBReloadableInferEngine对象。
+  // 但一个CloneDBReloadableInferEngine对象，可以包含N个EngineCore。
 
-  virtual int load(const configure::EngineDesc& conf) {
-    // 加载进程级模型数据
-    if (!_pd ||
-        DBReloadableInferEngine<EngineCore>::load_data(_pd, conf) != 0) {
-      LOG(ERROR) << "Failed to create common model from [" << conf.model_dir()
-                 << "].";
-      return -1;
+  virtual int load_data(ModelData<EngineCore>* md,
+                        const configure::EngineDesc& conf) {
+    uint32_t next_idx = (md->current_idx + 1) % 2;
+    if (md->cores[next_idx]) {
+      delete md->cores[next_idx];
     }
-    LOG(WARNING) << "Succ load common model[" << _pd->cores[_pd->current_idx]
-                 << "], path[" << conf.model_dir() << "].";
+    md->cores[next_idx] = new (std::nothrow) EngineCore;
 
-    if (DBReloadableInferEngine<EngineCore>::_reload_vec.empty()) {
-      return 0;
+    // params.dump();
+    size_t gpu_ids_num = conf.gpu_ids_size();
+    im::bsf::AutoMutex lock(DBReloadableInferEngine<EngineCore>::_mutex);
+    int gpu_id = -1;
+    if (gpu_ids_num > 0) {
+      gpu_id = conf.gpu_ids(DBReloadableInferEngine<EngineCore>::gpu_index %
+                            gpu_ids_num);
     }
-
-    for (uint32_t ti = 0;
-         ti < DBReloadableInferEngine<EngineCore>::_reload_vec.size();
-         ++ti) {
-      if (load_data(DBReloadableInferEngine<EngineCore>::_reload_vec[ti],
-                    _pd->cores[_pd->current_idx]) != 0) {
-        LOG(ERROR) << "Failed reload engine model: " << ti;
+    // gpu_index will be set to be 0, when load() or proc_initial() is called.
+    // gpu_index < gpu_ids_num, means there are still not create on some GPU
+    // card.
+    // so we need to create the predictor.
+    // gpu_index >= gpu_ids_num, means each GPU card has already create one.
+    // so we need to clone the predictor.
+    if (DBReloadableInferEngine<EngineCore>::gpu_index < gpu_ids_num) {
+      if (!md->cores[next_idx] ||
+          md->cores[next_idx]->create(conf, gpu_id) != 0) {
+        LOG(ERROR) << "Failed create model, path: " << conf.model_dir();
         return -1;
       }
+      DBReloadableInferEngine<EngineCore>::gpu_index++;
+      md->current_idx = next_idx;
+      if (_cloneTemplate.size() <
+          DBReloadableInferEngine<EngineCore>::gpu_index) {
+        _cloneTemplate.push_back(md);
+      } else {
+        _cloneTemplate[DBReloadableInferEngine<EngineCore>::gpu_index - 1] = md;
+      }
+    } else {
+      // when gpu_id = -1, means we use cpu, but the index should be 0.
+      if (gpu_id == -1) gpu_id = 0;
+      if (!md->cores[next_idx] ||
+          md->cores[next_idx]->clone(_cloneTemplate[gpu_id]->get()) != 0) {
+        LOG(ERROR) << "Failed clone model from core";
+        return -1;
+      }
+      DBReloadableInferEngine<EngineCore>::gpu_index++;
+      md->current_idx = next_idx;
+      LOG(WARNING) << "core clone model succ, cur_idx[" << md->current_idx
+                   << "].";
     }
 
-    LOG(WARNING) << "Succ load clone model, path[" << conf.model_dir() << "]";
-    return 0;
-  }
-
-  // 加载线程级对象，多个线程级对象共用pd_core的模型数据
-  int load_data(ModelData<EngineCore>* td, EngineCore* pd_core) {
-    uint32_t next_idx = (td->current_idx + 1) % 2;
-    if (td->cores[next_idx]) {
-      delete td->cores[next_idx];
-    }
-
-    td->cores[next_idx] = new (std::nothrow) EngineCore;
-    if (!td->cores[next_idx] ||
-        td->cores[next_idx]->clone(pd_core->get()) != 0) {
-      LOG(ERROR) << "Failed clone model from pd_core[ " << pd_core << "], idx["
-                 << next_idx << "]";
-      return -1;
-    }
-    td->current_idx = next_idx;
-    LOG(WARNING) << "td_core[" << td->cores[td->current_idx]
-                 << "] clone model from pd_core[" << pd_core
-                 << "] succ, cur_idx[" << td->current_idx << "].";
-    return 0;
-  }
-
-  virtual int thrd_initialize_impl() {
-    // memory pool to be inited in non-serving-threads
-    if (MempoolWrapper::instance().thread_initialize() != 0) {
-      LOG(ERROR) << "Failed thread initialize mempool";
-      return -1;
-    }
-
-    ModelData<EngineCore>* md = new (std::nothrow) ModelData<EngineCore>;
-    if (!md || load_data(md, _pd->cores[_pd->current_idx]) != 0) {
-      LOG(ERROR) << "Failed clone thread data, origin_core["
-                 << _pd->cores[_pd->current_idx] << "].";
-      return -1;
-    }
-
-    THREAD_SETSPECIFIC(DBReloadableInferEngine<EngineCore>::_skey, md);
-    im::bsf::AutoMutex lock(DBReloadableInferEngine<EngineCore>::_mutex);
-    DBReloadableInferEngine<EngineCore>::_reload_vec.push_back(md);
     return 0;
   }
 
  protected:
-  ModelData<EngineCore>*
-      _pd;  // 进程级EngineCore，多个线程级EngineCore共用该对象的模型数据
+  // 模板EngineCore，如果已创建，则多个线程级EngineCore共用该对象的模型数据
+  std::vector<ModelData<EngineCore>*>
+      _cloneTemplate;
 };
 
 template <typename EngineCore>
@@ -505,8 +510,8 @@ class FluidInferEngine : public CloneDBReloadableInferEngine<EngineCore> {
     return 0;
   }
 
-  int task_infer_impl(const BatchTensor& in, BatchTensor& out) {  // NOLINT
-    return infer_impl(&in, &out);
+  int task_infer_impl(const void* in, void* out) {  // NOLINT
+    return infer_impl(in, out);
   }
 };
 
@@ -559,7 +564,7 @@ class VersionedInferEngine : public InferEngine {
 
   int infer_impl(const void* in, void* out, uint32_t batch_size = -1);
 
-  int task_infer_impl(const BatchTensor& in, BatchTensor& out);
+  int task_infer_impl(const void* in, void* out);
 
  private:
   boost::unordered_map<uint64_t, InferEngine*> _versions;
diff --git a/core/predictor/framework/server.cpp b/core/predictor/framework/server.cpp
old mode 100644
new mode 100755
index 25b4079509b5346277609648a44f8d361187708d..8ced6f1e9936059ada169633e21690d13bc48ae3
--- a/core/predictor/framework/server.cpp
+++ b/core/predictor/framework/server.cpp
@@ -91,6 +91,7 @@ int ServerManager::start_and_wait() {
     }
   }
 
+  // rpc multi-thread start from here.
   if (_server.Start(FLAGS_port, &_options) != 0) {
     LOG(ERROR) << "Failed to start Paddle Inference Server";
     return -1;
diff --git a/core/predictor/mempool/mempool.cpp b/core/predictor/mempool/mempool.cpp
old mode 100644
new mode 100755
diff --git a/core/predictor/mempool/mempool.h b/core/predictor/mempool/mempool.h
old mode 100644
new mode 100755
index a10e8f97a59a148ace77c575cd2c70d2dac79603..bc18d89f3fa28bd2da27118aac70ae36237d72e8
--- a/core/predictor/mempool/mempool.h
+++ b/core/predictor/mempool/mempool.h
@@ -129,7 +129,7 @@ class FreeList {
     to get the class Pointer
     for example
     T is the member of class Node, T data, 'data' is the name.
-    T* value is the member(pointer type) class Node
+    T* value is the member(pointer type) of class Node
     so we can get the Node* by calling container_of(value, Node, data)
     */
     Node* node = container_of(value, Node, data);
@@ -261,7 +261,11 @@ struct BlockReference {
 
 // because BlockFreeList is a threal-safe Singleton.
 // so we don`t release Block, it is global memory.
-// total number is 32*1024
+// total number is 256*1024.
+// the MAX_BLOCK_COUNT of Region(one thread one Region) is 1024.
+// so BlockFreeList allow 256 Region(means 256 thread).
+// the memory used by BlockFreeListType is sizeof(void*)*256*1024.
+// Block(2MB) memory is created only when get() is called.
 class BlockFreeList {
  public:
   static const int MAX_BLOCK_COUNT = 256 * 1024;
@@ -374,7 +378,8 @@ class Mempool {
   void* malloc(size_t size) {
     size = _align(size);
     // It does not enter the if statement the first time.
-    // Because the block has not been used up, it will enter.
+    // The if statement may enter after the block is created.
+    // If the block has not been used up, it will enter.
     if (size <= _free_size) {
       void* p = _free_cursor;
       _free_size -= size;
@@ -392,7 +397,7 @@ class Mempool {
       return;
     }
 
-    // memory in Block，update the pointer.
+    // memory in _block，update the pointer.
     if (_free_cursor - size == static_cast<char*>(p)) {
       // for example, you need to release -(8+1)bytes
       // you can only release -8bytes，cause -(8+2)byte is used by other.
@@ -424,9 +429,8 @@ class Mempool {
     }
 
     // 可能返回的是单独Region中malloc的内存。
-    // 也可能是Block，例如new_size=1M, old_data原本的指针头就在1.2M处，old_size
-    // =
-    // 0.5M
+    // 也可能是Block，例如new_size=1M, old_data原本的指针头就在1.2M处
+    // old_size = 0.5M
     // 此时,_free_size = 0.3M，new_size<2M,但是required = 1-0.5 >0.3
     // 分配出来的就是Block，但是该Block没有并很完美的利用完全。
     void* p = this->malloc_from_region(new_size);
diff --git a/core/predictor/src/pdserving.cpp b/core/predictor/src/pdserving.cpp
old mode 100755
new mode 100644
index e88d9b3b2aaa03ccbb7f903485bdffecfa6f7222..f637e8a9cdbeeb75b7ea079e72124f6f9873ffd9
--- a/core/predictor/src/pdserving.cpp
+++ b/core/predictor/src/pdserving.cpp
@@ -69,12 +69,15 @@ DEFINE_bool(V, false, "print version, bool");
 DEFINE_bool(g, false, "user defined gflag path");
 DECLARE_string(flagfile);
 
+//
+/*
 namespace bthread {
 extern pthread_mutex_t g_task_control_mutex;
 }
 pthread_mutex_t g_worker_start_fn_mutex = PTHREAD_MUTEX_INITIALIZER;
-
+*/
 void pthread_worker_start_fn() {
+  /*
   while (pthread_mutex_lock(&g_worker_start_fn_mutex) != 0) {
   }
 
@@ -83,15 +86,18 @@ void pthread_worker_start_fn() {
   if (lock_status == EBUSY || lock_status == EAGAIN) {
     pthread_mutex_unlock(&bthread::g_task_control_mutex);
   }
+  */
   Resource::instance().thread_initialize();
 
   // Try to avoid deadlock in bthread
+  /*
   if (lock_status == EBUSY || lock_status == EAGAIN) {
     while (pthread_mutex_lock(&bthread::g_task_control_mutex) != 0) {
     }
   }
 
   pthread_mutex_unlock(&g_worker_start_fn_mutex);
+  */
 }
 
 static void g_change_server_port() {
@@ -126,7 +132,7 @@ int main(int argc, char** argv) {
     return 0;
   }
 
-  //google::ParseCommandLineFlags(&argc, &argv, true);
+  // google::ParseCommandLineFlags(&argc, &argv, true);
 
   g_change_server_port();
 
@@ -202,7 +208,7 @@ int main(int argc, char** argv) {
   }
   VLOG(2) << "Succ call pthread worker start function";
 
-  //this is not used by any code segment,which can be cancelled.
+  // this is not used by any code segment,which can be cancelled.
   if (Resource::instance().general_model_initialize(FLAGS_resource_path,
                                                     FLAGS_resource_file) != 0) {
     LOG(ERROR) << "Failed to initialize general model conf: "
diff --git a/paddle_inference/paddle/include/paddle_engine.h b/paddle_inference/paddle/include/paddle_engine.h
index 262a0378bef5caacbfdf5a3d2b46ed6ce598cb10..d2027ed2823ace230a14e85eb6ee37fe82e5a21f 100755
--- a/paddle_inference/paddle/include/paddle_engine.h
+++ b/paddle_inference/paddle/include/paddle_engine.h
@@ -19,6 +19,7 @@
 #include <map>
 #include <memory>
 #include <string>
+#include <utility>
 #include <vector>
 #include "core/configure/include/configure_parser.h"
 #include "core/configure/inferencer_configure.pb.h"
@@ -96,7 +97,7 @@ class EngineCore {
     return true;
   }
 
-  virtual int create(const configure::EngineDesc& conf) = 0;
+  virtual int create(const configure::EngineDesc& conf, int gpu_id) = 0;
 
   virtual int clone(void* predictor) {
     if (predictor == NULL) {
@@ -121,7 +122,7 @@ class EngineCore {
 // Paddle Inference Engine
 class PaddleInferenceEngine : public EngineCore {
  public:
-  int create(const configure::EngineDesc& engine_conf) {
+  int create(const configure::EngineDesc& engine_conf, int gpu_id) {
     std::string model_path = engine_conf.model_dir();
     if (access(model_path.c_str(), F_OK) == -1) {
       LOG(ERROR) << "create paddle predictor failed, path not exits: "
@@ -162,7 +163,11 @@ class PaddleInferenceEngine : public EngineCore {
     config.SetCpuMathLibraryNumThreads(1);
     if (engine_conf.has_use_gpu() && engine_conf.use_gpu()) {
       // 2000MB GPU memory
-      config.EnableUseGpu(2000, FLAGS_gpuid);
+      config.EnableUseGpu(50, gpu_id);
+      if (engine_conf.has_gpu_multi_stream() &&
+          engine_conf.gpu_multi_stream()) {
+        config.EnableGpuMultiStream();
+      }
     }
     precision_type = GetPrecision(FLAGS_precision);
 
@@ -174,8 +179,13 @@ class PaddleInferenceEngine : public EngineCore {
     }
 
     if (engine_conf.has_use_trt() && engine_conf.use_trt()) {
+      config.SwitchIrOptim(true);
       if (!engine_conf.has_use_gpu() || !engine_conf.use_gpu()) {
-        config.EnableUseGpu(2000, FLAGS_gpuid);
+        config.EnableUseGpu(50, gpu_id);
+        if (engine_conf.has_gpu_multi_stream() &&
+            engine_conf.gpu_multi_stream()) {
+          config.EnableGpuMultiStream();
+        }
       }
       config.EnableTensorRtEngine(1 << 20,
                                   max_batch,
@@ -203,7 +213,7 @@ class PaddleInferenceEngine : public EngineCore {
       if (precision_type == PrecisionType::kInt8) {
         config.EnableMkldnnQuantizer();
         auto quantizer_config = config.mkldnn_quantizer_config();
-        // TODO: warmup data
+        // TODO(somebody): warmup data
         // quantizer_config -> SetWarmupData();
         // quantizer_config -> SetWarmupBatchSize();
         // quantizer_config -> SetEnabledOpTypes(4);
diff --git a/python/paddle_serving_client/client.py b/python/paddle_serving_client/client.py
index 0ccdbb1435fbca1a9e576d1a5ad01517d4ed352d..0c5aa23c183990bc248053c43a430cba2d2008a2 100755
--- a/python/paddle_serving_client/client.py
+++ b/python/paddle_serving_client/client.py
@@ -307,6 +307,8 @@ class Client(object):
         if isinstance(feed, dict):
             feed_batch.append(feed)
         elif isinstance(feed, list):
+            if len(feed) != 1:
+                raise ValueError("Feed only list = [dict]")
             feed_batch = feed
         else:
             raise ValueError("Feed only accepts dict and list of dict")
@@ -326,7 +328,7 @@ class Client(object):
 
         fetch_names = []
         counter = 0
-        batch_size = len(feed_batch)
+        batch_size = len(feed_batch)  # batch_size must be 1.
 
         for key in fetch_list:
             if key in self.fetch_names_:
diff --git a/python/paddle_serving_server/serve.py b/python/paddle_serving_server/serve.py
index 101b7b4b460fd125541ed62f28b38d7512b5bda8..b69fbca6eef1ab38fbbd330e4fee44eb4d91d82e 100755
--- a/python/paddle_serving_server/serve.py
+++ b/python/paddle_serving_server/serve.py
@@ -39,7 +39,16 @@ def serve_args():
         "--port", type=int, default=9292, help="Port of the starting gpu")
     parser.add_argument(
         "--device", type=str, default="gpu", help="Type of device")
-    parser.add_argument("--gpu_ids", type=str, default="", help="gpu ids")
+    parser.add_argument(
+        "--gpu_ids", type=str, default="", nargs="+", help="gpu ids")
+    parser.add_argument(
+        "--op_num", type=int, default=0, nargs="+", help="Number of each op")
+    parser.add_argument(
+        "--op_max_batch",
+        type=int,
+        default=32,
+        nargs="+",
+        help="Max batch of each op")
     parser.add_argument(
         "--model", type=str, default="", nargs="+", help="Model for serving")
     parser.add_argument(
@@ -99,85 +108,20 @@ def serve_args():
         type=str,
         default=None,
         help="container_id for authentication")
+    parser.add_argument(
+        "--gpu_multi_stream",
+        default=False,
+        action="store_true",
+        help="Use gpu_multi_stream")
     return parser.parse_args()
 
 
-def start_standard_model(serving_port):  # pylint: disable=doc-string-missing
-    args = serve_args()
-    thread_num = args.thread
-    model = args.model
-    port = serving_port
-    workdir = args.workdir
-    device = args.device
-    mem_optim = args.mem_optim_off is False
-    ir_optim = args.ir_optim
-    max_body_size = args.max_body_size
-    use_mkl = args.use_mkl
-    use_encryption_model = args.use_encryption_model
-    use_multilang = args.use_multilang
-
-    if model == "":
-        print("You must specify your serving model")
-        exit(-1)
+def start_gpu_card_model(gpu_mode, port, args):  # pylint: disable=doc-string-missing
 
-    for single_model_config in args.model:
-        if os.path.isdir(single_model_config):
-            pass
-        elif os.path.isfile(single_model_config):
-            raise ValueError("The input of --model should be a dir not file.")
-
-    import paddle_serving_server as serving
-    op_maker = serving.OpMaker()
-    op_seq_maker = serving.OpSeqMaker()
-
-    read_op = op_maker.create('general_reader')
-    op_seq_maker.add_op(read_op)
-
-    for idx, single_model in enumerate(model):
-        infer_op_name = "general_infer"
-        #Temporary support for OCR model,it will be completely revised later
-        #If you want to use this, C++ server must compile with WITH_OPENCV option.
-        if len(model) == 2 and idx == 0 and model[0] == 'ocr_det_model':
-            infer_op_name = "general_detection"
-        general_infer_op = op_maker.create(infer_op_name)
-        op_seq_maker.add_op(general_infer_op)
-
-    general_response_op = op_maker.create('general_response')
-    op_seq_maker.add_op(general_response_op)
-
-    server = None
-    if use_multilang:
-        server = serving.MultiLangServer()
-    else:
-        server = serving.Server()
-    server.set_op_sequence(op_seq_maker.get_op_sequence())
-    server.set_num_threads(thread_num)
-    server.set_memory_optimize(mem_optim)
-    server.set_ir_optimize(ir_optim)
-    server.use_mkl(use_mkl)
-    server.set_max_body_size(max_body_size)
-    server.set_port(port)
-    server.set_precision(args.precision)
-    server.set_use_calib(args.use_calib)
-    server.use_encryption_model(use_encryption_model)
-    if args.product_name != None:
-        server.set_product_name(args.product_name)
-    if args.container_id != None:
-        server.set_container_id(args.container_id)
-
-    server.load_model_config(model)
-    server.prepare_server(workdir=workdir, port=port, device=device)
-    server.run_server()
-
-
-def start_gpu_card_model(index, gpuid, port, args):  # pylint: disable=doc-string-missing
-    workdir = args.workdir
-    gpuid = int(gpuid)
     device = "gpu"
-    if gpuid == -1:
+    if gpu_mode == False:
         device = "cpu"
-    elif gpuid >= 0:
-        port = port + index
+
     thread_num = args.thread
     model = args.model
     mem_optim = args.mem_optim_off is False
@@ -185,8 +129,7 @@ def start_gpu_card_model(index, gpuid, port, args):  # pylint: disable=doc-strin
     use_mkl = args.use_mkl
     max_body_size = args.max_body_size
     use_multilang = args.use_multilang
-    if gpuid >= 0:
-        workdir = "{}_{}".format(args.workdir, gpuid)
+    workdir = "{}_{}".format(args.workdir, port)
 
     if model == "":
         print("You must specify your serving model")
@@ -226,8 +169,19 @@ def start_gpu_card_model(index, gpuid, port, args):  # pylint: disable=doc-strin
     server.set_memory_optimize(mem_optim)
     server.set_ir_optimize(ir_optim)
     server.set_max_body_size(max_body_size)
-    if args.use_trt:
+
+    if args.use_trt and device == "gpu":
         server.set_trt()
+        server.set_ir_optimize(True)
+
+    if args.gpu_multi_stream and device == "gpu":
+        server.set_gpu_multi_stream()
+
+    if args.op_num:
+        server.set_op_num(args.op_num)
+
+    if args.op_max_batch:
+        server.set_op_max_batch(args.op_max_batch)
 
     if args.use_lite:
         server.set_lite()
@@ -247,48 +201,40 @@ def start_gpu_card_model(index, gpuid, port, args):  # pylint: disable=doc-strin
         port=port,
         device=device,
         use_encryption_model=args.use_encryption_model)
-    if gpuid >= 0:
-        server.set_gpuid(gpuid)
+    if gpu_mode == True:
+        server.set_gpuid(args.gpu_ids)
     server.run_server()
 
 
 def start_multi_card(args, serving_port=None):  # pylint: disable=doc-string-missing
-    gpus = ""
+    gpus = []
     if serving_port == None:
         serving_port = args.port
+
     if args.gpu_ids == "":
         gpus = []
     else:
-        gpus = args.gpu_ids.split(",")
+        #check the gpu_id is valid or not.
+        gpus = args.gpu_ids
+        if isinstance(gpus, str):
+            gpus = [gpus]
         if "CUDA_VISIBLE_DEVICES" in os.environ:
             env_gpus = os.environ["CUDA_VISIBLE_DEVICES"].split(",")
-            for ids in gpus:
-                if ids not in env_gpus:
-                    print("gpu_ids is not in CUDA_VISIBLE_DEVICES.")
-                    exit(-1)
-        else:
-            env_gpus = []
+            for op_gpus_str in gpus:
+                op_gpu_list = op_gpus_str.split(",")
+                for ids in op_gpu_list:
+                    if ids not in env_gpus:
+                        print("gpu_ids is not in CUDA_VISIBLE_DEVICES.")
+                        exit(-1)
+
     if args.use_lite:
         print("run using paddle-lite.")
-        start_gpu_card_model(-1, -1, serving_port, args)
+        start_gpu_card_model(False, serving_port, args)
     elif len(gpus) <= 0:
         print("gpu_ids not set, going to run cpu service.")
-        start_gpu_card_model(-1, -1, serving_port, args)
+        start_gpu_card_model(False, serving_port, args)
     else:
-        gpu_processes = []
-        for i, gpu_id in enumerate(gpus):
-            p = Process(
-                target=start_gpu_card_model,
-                args=(
-                    i,
-                    gpu_id,
-                    serving_port,
-                    args, ))
-            gpu_processes.append(p)
-        for p in gpu_processes:
-            p.start()
-        for p in gpu_processes:
-            p.join()
+        start_gpu_card_model(True, serving_port, args)
 
 
 class MainService(BaseHTTPRequestHandler):
@@ -395,14 +341,28 @@ if __name__ == "__main__":
         from .web_service import WebService
         web_service = WebService(name=args.name)
         web_service.load_model_config(args.model)
-        gpu_ids = args.gpu_ids
-        if gpu_ids == "":
+
+        if args.gpu_ids == "":
+            gpus = []
+        else:
+            #check the gpu_id is valid or not.
+            gpus = args.gpu_ids
+            if isinstance(gpus, str):
+                gpus = [gpus]
             if "CUDA_VISIBLE_DEVICES" in os.environ:
-                gpu_ids = os.environ["CUDA_VISIBLE_DEVICES"]
-        if len(gpu_ids) > 0:
-            web_service.set_gpus(gpu_ids)
+                env_gpus = os.environ["CUDA_VISIBLE_DEVICES"].split(",")
+                for op_gpus_str in gpus:
+                    op_gpu_list = op_gpus_str.split(",")
+                    for ids in op_gpu_list:
+                        if ids not in env_gpus:
+                            print("gpu_ids is not in CUDA_VISIBLE_DEVICES.")
+                            exit(-1)
+
+        if len(gpus) > 0:
+            web_service.set_gpus(gpus)
+        workdir = "{}_{}".format(args.workdir, args.port)
         web_service.prepare_server(
-            workdir=args.workdir,
+            workdir=workdir,
             port=args.port,
             device=args.device,
             use_lite=args.use_lite,
@@ -410,7 +370,11 @@ if __name__ == "__main__":
             ir_optim=args.ir_optim,
             thread_num=args.thread,
             precision=args.precision,
-            use_calib=args.use_calib)
+            use_calib=args.use_calib,
+            use_trt=args.use_trt,
+            gpu_multi_stream=args.gpu_multi_stream,
+            op_num=args.op_num,
+            op_max_batch=args.op_max_batch)
         web_service.run_rpc_service()
 
         app_instance = Flask(__name__)
diff --git a/python/paddle_serving_server/server.py b/python/paddle_serving_server/server.py
index 6d8077ad3a3a10c943201f9a945a2ef92b370df0..919d8ba01f892a5532d0bc70f00e7035c19a305a 100755
--- a/python/paddle_serving_server/server.py
+++ b/python/paddle_serving_server/server.py
@@ -81,8 +81,11 @@ class Server(object):
         self.use_local_bin = False
         self.mkl_flag = False
         self.device = "cpu"
-        self.gpuid = 0
+        self.gpuid = []
+        self.op_num = [0]
+        self.op_max_batch = [32]
         self.use_trt = False
+        self.gpu_multi_stream = False
         self.use_lite = False
         self.use_xpu = False
         self.model_config_paths = collections.OrderedDict()
@@ -137,11 +140,13 @@ class Server(object):
     def set_ir_optimize(self, flag=False):
         self.ir_optimization = flag
 
+    # Multi-Server does not have this Function. 
     def set_product_name(self, product_name=None):
         if product_name == None:
             raise ValueError("product_name can't be None.")
         self.product_name = product_name
 
+    # Multi-Server does not have this Function.
     def set_container_id(self, container_id):
         if container_id == None:
             raise ValueError("container_id can't be None.")
@@ -163,12 +168,21 @@ class Server(object):
     def set_device(self, device="cpu"):
         self.device = device
 
-    def set_gpuid(self, gpuid=0):
+    def set_gpuid(self, gpuid):
         self.gpuid = gpuid
 
+    def set_op_num(self, op_num):
+        self.op_num = op_num
+
+    def set_op_max_batch(self, op_max_batch):
+        self.op_max_batch = op_max_batch
+
     def set_trt(self):
         self.use_trt = True
 
+    def set_gpu_multi_stream(self):
+        self.gpu_multi_stream = True
+
     def set_lite(self):
         self.use_lite = True
 
@@ -178,6 +192,27 @@ class Server(object):
     def _prepare_engine(self, model_config_paths, device, use_encryption_model):
         if self.model_toolkit_conf == None:
             self.model_toolkit_conf = []
+        self.device = device
+
+        if isinstance(self.gpuid, str):
+            self.gpuid = [self.gpuid]
+        if len(self.gpuid) == 0:
+            if self.device == "gpu" or self.use_trt:
+                self.gpuid.append("0")
+            else:
+                self.gpuid.append("-1")
+
+        if isinstance(self.op_num, int):
+            self.op_num = [self.op_num]
+        if len(self.op_num) == 0:
+            self.op_num.append(0)
+
+        if isinstance(self.op_max_batch, int):
+            self.op_max_batch = [self.op_max_batch]
+        if len(self.op_max_batch) == 0:
+            self.op_max_batch.append(32)
+
+        index = 0
 
         for engine_name, model_config_path in model_config_paths.items():
             engine = server_sdk.EngineDesc()
@@ -186,19 +221,28 @@ class Server(object):
             engine.reloadable_meta = model_config_path + "/fluid_time_file"
             os.system("touch {}".format(engine.reloadable_meta))
             engine.reloadable_type = "timestamp_ne"
-            engine.runtime_thread_num = 0
-            engine.batch_infer_size = 0
-            engine.enable_batch_align = 0
+            engine.runtime_thread_num = self.op_num[index % len(self.op_num)]
+            engine.batch_infer_size = self.op_max_batch[index %
+                                                        len(self.op_max_batch)]
+
+            engine.enable_batch_align = 1
             engine.model_dir = model_config_path
             engine.enable_memory_optimization = self.memory_optimization
             engine.enable_ir_optimization = self.ir_optimization
             engine.use_trt = self.use_trt
+            engine.gpu_multi_stream = self.gpu_multi_stream
             engine.use_lite = self.use_lite
             engine.use_xpu = self.use_xpu
             engine.use_gpu = False
-            if self.device == "gpu":
+            if self.device == "gpu" or self.use_trt:
                 engine.use_gpu = True
 
+            if len(self.gpuid) == 0:
+                raise ValueError("CPU: self.gpuid = -1, GPU: must set it ")
+            op_gpu_list = self.gpuid[index % len(self.gpuid)].split(",")
+            for ids in op_gpu_list:
+                engine.gpu_ids.extend([int(ids)])
+
             if os.path.exists('{}/__params__'.format(model_config_path)):
                 engine.combined_model = True
             else:
@@ -208,6 +252,7 @@ class Server(object):
             engine.type = "PADDLE_INFER"
             self.model_toolkit_conf.append(server_sdk.ModelToolkitConf())
             self.model_toolkit_conf[-1].engines.extend([engine])
+            index = index + 1
 
     def _prepare_infer_service(self, port):
         if self.infer_service_conf == None:
@@ -332,7 +377,11 @@ class Server(object):
         self.mkl_flag = flag
 
     def check_avx(self):
-        p = subprocess.Popen(['cat /proc/cpuinfo | grep avx 2>/dev/null'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True)
+        p = subprocess.Popen(
+            ['cat /proc/cpuinfo | grep avx 2>/dev/null'],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            shell=True)
         out, err = p.communicate()
         if err == b'' and len(out) > 0:
             return True
@@ -431,6 +480,7 @@ class Server(object):
                        device="cpu",
                        use_encryption_model=False,
                        cube_conf=None):
+        self.device = device
         if workdir == None:
             workdir = "./tmp"
             os.system("mkdir -p {}".format(workdir))
@@ -533,7 +583,6 @@ class Server(object):
                       "-workflow_path {} " \
                       "-workflow_file {} " \
                       "-bthread_concurrency {} " \
-                      "-gpuid {} " \
                       "-max_body_size {} ".format(
                           self.bin_path,
                           self.workdir,
@@ -549,7 +598,6 @@ class Server(object):
                           self.workdir,
                           self.workflow_fn,
                           self.num_threads,
-                          self.gpuid,
                           self.max_body_size)
         print("Going to Run Comand")
         print(command)
@@ -615,9 +663,27 @@ class MultiLangServer(object):
     def set_ir_optimize(self, flag=False):
         self.bserver_.set_ir_optimize(flag)
 
-    def set_gpuid(self, gpuid=0):
+    def set_gpuid(self, gpuid):
         self.bserver_.set_gpuid(gpuid)
 
+    def set_op_num(self, op_num):
+        self.bserver_.set_op_num(op_num)
+
+    def set_op_max_batch(self, op_max_batch):
+        self.bserver_.set_op_max_batch(op_max_batch)
+
+    def set_trt(self):
+        self.bserver_.set_trt()
+
+    def set_gpu_multi_stream(self):
+        self.bserver_.set_gpu_multi_stream()
+
+    def set_lite(self):
+        self.bserver_.set_lite()
+
+    def set_xpu(self):
+        self.bserver_.set_xpu()
+
     def load_model_config(self,
                           server_config_dir_paths,
                           client_config_path=None):
@@ -674,6 +740,7 @@ class MultiLangServer(object):
                        device="cpu",
                        use_encryption_model=False,
                        cube_conf=None):
+        self.device = device
         if not self._port_is_available(port):
             raise SystemExit("Port {} is already used".format(port))
         default_port = 12000
diff --git a/python/paddle_serving_server/web_service.py b/python/paddle_serving_server/web_service.py
index 3db3b7bc47f497e53993b51631910828a0af8ed3..87e16dcf96247049474c844de0efa09345d564cd 100755
--- a/python/paddle_serving_server/web_service.py
+++ b/python/paddle_serving_server/web_service.py
@@ -105,25 +105,33 @@ class WebService(object):
 
     def set_gpus(self, gpus):
         print("This API will be deprecated later. Please do not use it")
-        self.gpus = [int(x) for x in gpus.split(",")]
+        self.gpus = gpus
 
     def default_rpc_service(self,
-                            workdir="conf",
+                            workdir,
                             port=9292,
-                            gpuid=0,
+                            gpus=-1,
                             thread_num=2,
                             mem_optim=True,
                             use_lite=False,
                             use_xpu=False,
                             ir_optim=False,
                             precision="fp32",
-                            use_calib=False):
+                            use_calib=False,
+                            use_trt=False,
+                            gpu_multi_stream=False,
+                            op_num=None,
+                            op_max_batch=None):
         device = "gpu"
-        if gpuid == -1:
+        server = Server()
+
+        if gpus == -1:
             if use_lite:
                 device = "arm"
             else:
                 device = "cpu"
+        else:
+            server.set_gpuid(gpus)
         op_maker = OpMaker()
         op_seq_maker = OpSeqMaker()
 
@@ -142,7 +150,6 @@ class WebService(object):
         general_response_op = op_maker.create('general_response')
         op_seq_maker.add_op(general_response_op)
 
-        server = Server()
         server.set_op_sequence(op_seq_maker.get_op_sequence())
         server.set_num_threads(thread_num)
         server.set_memory_optimize(mem_optim)
@@ -151,6 +158,19 @@ class WebService(object):
         server.set_precision(precision)
         server.set_use_calib(use_calib)
 
+        if use_trt and device == "gpu":
+            server.set_trt()
+            server.set_ir_optimize(True)
+
+        if gpu_multi_stream and device == "gpu":
+            server.set_gpu_multi_stream()
+
+        if op_num:
+            server.set_op_num(op_num)
+
+        if op_max_batch:
+            server.set_op_max_batch(op_max_batch)
+
         if use_lite:
             server.set_lite()
         if use_xpu:
@@ -158,8 +178,7 @@ class WebService(object):
 
         server.load_model_config(self.server_config_dir_paths
                                  )  #brpc Server support server_config_dir_paths
-        if gpuid >= 0:
-            server.set_gpuid(gpuid)
+
         server.prepare_server(workdir=workdir, port=port, device=device)
         return server
 
@@ -180,24 +199,29 @@ class WebService(object):
                     use_xpu=self.use_xpu,
                     ir_optim=self.ir_optim,
                     precision=self.precision,
-                    use_calib=self.use_calib))
+                    use_calib=self.use_calib,
+                    op_num=self.op_num,
+                    op_max_batch=self.op_max_batch))
         else:
-            for i, gpuid in enumerate(self.gpus):
-                self.rpc_service_list.append(
-                    self.default_rpc_service(
-                        "{}_{}".format(self.workdir, i),
-                        self.port_list[i],
-                        gpuid,
-                        thread_num=self.thread_num,
-                        mem_optim=self.mem_optim,
-                        use_lite=self.use_lite,
-                        use_xpu=self.use_xpu,
-                        ir_optim=self.ir_optim,
-                        precision=self.precision,
-                        use_calib=self.use_calib))
+            self.rpc_service_list.append(
+                self.default_rpc_service(
+                    self.workdir,
+                    self.port_list[0],
+                    self.gpus,
+                    thread_num=self.thread_num,
+                    mem_optim=self.mem_optim,
+                    use_lite=self.use_lite,
+                    use_xpu=self.use_xpu,
+                    ir_optim=self.ir_optim,
+                    precision=self.precision,
+                    use_calib=self.use_calib,
+                    use_trt=self.use_trt,
+                    gpu_multi_stream=self.gpu_multi_stream,
+                    op_num=self.op_num,
+                    op_max_batch=self.op_max_batch))
 
     def prepare_server(self,
-                       workdir="",
+                       workdir,
                        port=9393,
                        device="gpu",
                        precision="fp32",
@@ -205,9 +229,12 @@ class WebService(object):
                        use_lite=False,
                        use_xpu=False,
                        ir_optim=False,
-                       gpuid=0,
                        thread_num=2,
-                       mem_optim=True):
+                       mem_optim=True,
+                       use_trt=False,
+                       gpu_multi_stream=False,
+                       op_num=None,
+                       op_max_batch=None):
         print("This API will be deprecated later. Please do not use it")
         self.workdir = workdir
         self.port = port
@@ -219,25 +246,23 @@ class WebService(object):
         self.use_xpu = use_xpu
         self.ir_optim = ir_optim
         self.mem_optim = mem_optim
-        self.gpuid = gpuid
         self.port_list = []
+        self.use_trt = use_trt
+        self.gpu_multi_stream = gpu_multi_stream
+        self.op_num = op_num
+        self.op_max_batch = op_max_batch
+
         default_port = 12000
         for i in range(1000):
             if port_is_available(default_port + i):
                 self.port_list.append(default_port + i)
-            if len(self.port_list) > len(self.gpus):
                 break
 
     def _launch_web_service(self):
-        gpu_num = len(self.gpus)
         self.client = Client()
         self.client.load_client_config(self.client_config_path)
         endpoints = ""
-        if gpu_num > 0:
-            for i in range(gpu_num):
-                endpoints += "127.0.0.1:{},".format(self.port_list[i])
-        else:
-            endpoints = "127.0.0.1:{}".format(self.port_list[0])
+        endpoints = "127.0.0.1:{}".format(self.port_list[0])
         self.client.connect([endpoints])
 
     def get_prediction(self, request):
@@ -324,10 +349,10 @@ class WebService(object):
             # default self.gpus = [0].
             if len(self.gpus) == 0:
                 self.gpus.append(0)
+
+            gpu_id = (self.gpus[0].split(","))[0]
             self.client.load_model_config(
-                self.server_config_dir_paths[0],
-                use_gpu=True,
-                gpu_id=self.gpus[0])
+                self.server_config_dir_paths[0], use_gpu=True, gpu_id=gpu_id)
         else:
             self.client.load_model_config(
                 self.server_config_dir_paths[0], use_gpu=False)