diff --git a/core/general-server/op/general_infer_helper.h b/core/general-server/op/general_infer_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..b5d6d7f23f6474cd1b77889ce6192d890920f85e
--- /dev/null
+++ b/core/general-server/op/general_infer_helper.h
@@ -0,0 +1,65 @@
+// Copyright (c) 2020 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
+
+#include <vector>
+#ifdef BCLOUD
+#ifdef WITH_GPU
+#include "paddle/paddle_inference_api.h"
+#else
+#include "paddle/fluid/inference/api/paddle_inference_api.h"
+#endif
+#else
+#include "paddle_inference_api.h"  // NOLINT
+#endif
+#include <string>
+
+namespace baidu {
+namespace paddle_serving {
+namespace serving {
+
+static const char* GENERAL_MODEL_NAME = "general_model";
+
+struct GeneralBlob {
+  std::vector<paddle::PaddleTensor> tensor_vector;
+  double infer_time;
+  std::vector<std::string> fetch_name_vector;
+
+  void Clear() {
+    size_t tensor_count = tensor_vector.size();
+    for (size_t ti = 0; ti < tensor_count; ++ti) {
+      tensor_vector[ti].shape.clear();
+    }
+    tensor_vector.clear();
+  }
+  
+  int GetBatchSize() const {
+    if (tensor_vector.size() > 0) {
+      if (tensor_vector[0].lod.size() == 1) {
+        return tensor_vector[0].lod[0].size() - 1;
+      } else {
+        return tensor_vector[0].shape[0];
+      }
+    } else {
+      return -1;
+    }
+  }
+
+  std::string ShortDebugString() const { return "Not implemented!"; }
+};
+
+}  // namespace serving
+}  // namespace paddle_serving
+}  // namespace baidu
diff --git a/core/general-server/op/general_infer_op.cpp b/core/general-server/op/general_infer_op.cpp
index 6755e1cc4502aca70314166038453c5013e582f9..d3761000fba5ce0663b9c9b1759cbf6a64c912e8 100644
--- a/core/general-server/op/general_infer_op.cpp
+++ b/core/general-server/op/general_infer_op.cpp
@@ -17,7 +17,6 @@
 #include <memory>
 #include <sstream>
 #include "core/general-server/op/general_infer_op.h"
-#include "core/general-server/op/general_reader_op.h"
 #include "core/predictor/framework/infer.h"
 #include "core/predictor/framework/memory.h"
 #include "core/predictor/framework/resource.h"
@@ -37,23 +36,22 @@ using baidu::paddle_serving::predictor::InferManager;
 using baidu::paddle_serving::predictor::PaddleGeneralModelConfig;
 
 int GeneralInferOp::inference() {
-  const GeneralReaderOutput *reader_out =
-      get_depend_argument<GeneralReaderOutput>("general_reader_op");
-  if (!reader_out) {
+  const GeneralBlob * input_blob =
+      get_depend_argument<GeneralBlob>(pre_name());
+
+  GeneralBlob * output_blob = mutable_data<GeneralBlob>();
+
+  if (!input_blob) {
     LOG(ERROR) << "Failed mutable depended argument, op:"
-               << "general_reader_op";
+               << pre_name();
     return -1;
   }
 
-  int reader_status = reader_out->reader_status;
-  if (reader_status != 0) {
-    LOG(ERROR) << "Read request wrong.";
-    return -1;
-  }
+  const TensorVector *in = &input_blob->tensor_vector;
+  TensorVector *out = &output_blob->tensor_vector;
+  int batch_size = input_blob->GetBatchSize();
 
-  const TensorVector *in = &reader_out->tensor_vector;
-  TensorVector *out = butil::get_object<TensorVector>();
-  int batch_size = (*in)[0].shape[0];
+  VLOG(2) << "infer batch size: " << batch_size;
   // infer
   Timer timeline;
   double infer_time = 0.0;
@@ -65,73 +63,6 @@ int GeneralInferOp::inference() {
   timeline.Pause();
   infer_time = timeline.ElapsedUS();
 
-  const Request *req = dynamic_cast<const Request *>(get_request_message());
-
-  VLOG(2) << "start to call load general model_conf op";
-  baidu::paddle_serving::predictor::Resource &resource =
-      baidu::paddle_serving::predictor::Resource::instance();
-  
-  VLOG(2) << "get resource pointer done.";
-  std::shared_ptr<PaddleGeneralModelConfig> model_config =
-      resource.get_general_model_config();
-
-  std::vector<int> fetch_index;
-  fetch_index.resize(req->fetch_var_names_size());
-  for (int i = 0; i < req->fetch_var_names_size(); ++i) {
-    fetch_index[i] =
-        model_config->_fetch_alias_name_to_index[req->fetch_var_names(i)];
-  }
-  
-  // response inst with only fetch_var_names
-  Response *res = mutable_data<Response>();
-
-  res->set_mean_infer_us(infer_time);
-
-  for (int i = 0; i < batch_size; ++i) {
-    FetchInst *fetch_inst = res->add_insts();
-    for (auto & idx : fetch_index) {
-      Tensor *tensor = fetch_inst->add_tensor_array();
-      // currently only response float tensor or lod_tensor
-      tensor->set_elem_type(1);
-      if (model_config->_is_lod_fetch[idx]) {
-        VLOG(2) << "out[" << idx << " is lod_tensor";
-        tensor->add_shape(-1);
-      } else {
-        VLOG(2) << "out[" << idx << "] is tensor";
-        for (int k = 1; k < out->at(idx).shape.size(); ++k) {
-          VLOG(2) << "shape[" << k - 1 << "]: "
-                  << out->at(idx).shape[k];
-          tensor->add_shape(out->at(idx).shape[k]);
-        }
-      }
-    }
-  }
-
-  int var_idx = 0;
-  for (auto & idx : fetch_index) {
-    float *data_ptr = static_cast<float *>(out->at(idx).data.data());
-    int cap = 1;
-    for (int j = 1; j < out->at(idx).shape.size(); ++j) {
-      cap *= out->at(idx).shape[j];
-    }
-    if (model_config->_is_lod_fetch[idx]) {
-      for (int j = 0; j < batch_size; ++j) {
-        for (int k = out->at(idx).lod[0][j];
-             k < out->at(idx).lod[0][j + 1]; k++) {
-          res->mutable_insts(j)->mutable_tensor_array(var_idx)->add_data(
-              reinterpret_cast<char *>(&(data_ptr[k])), sizeof(float));
-        }
-      }
-    } else {
-      for (int j = 0; j < batch_size; ++j) {
-        for (int k = j * cap; k < (j + 1) * cap; ++k) {
-          res->mutable_insts(j)->mutable_tensor_array(var_idx)->add_data(
-              reinterpret_cast<char *>(&(data_ptr[k])), sizeof(float));
-        }
-      }
-    }
-    var_idx++;
-  }
   return 0;
 }
 DEFINE_OP(GeneralInferOp);
diff --git a/core/general-server/op/general_infer_op.h b/core/general-server/op/general_infer_op.h
index f6860f0941afb941623bf9b876e128c06f5a0911..6c8d9fdc415122baf3eb94aaea5167579835737e 100644
--- a/core/general-server/op/general_infer_op.h
+++ b/core/general-server/op/general_infer_op.h
@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #pragma once
+#include <string>
 #include <vector>
 #ifdef BCLOUD
 #ifdef WITH_GPU
@@ -24,22 +25,21 @@
 #include "paddle_inference_api.h"  // NOLINT
 #endif
 #include "core/general-server/general_model_service.pb.h"
+#include "core/general-server/op/general_infer_helper.h"
 
 namespace baidu {
 namespace paddle_serving {
 namespace serving {
 
-static const char* GENERAL_MODEL_NAME = "general_model";
-
 class GeneralInferOp
-    : public baidu::paddle_serving::predictor::OpWithChannel<
-          baidu::paddle_serving::predictor::general_model::Response> {
+    : public baidu::paddle_serving::predictor::OpWithChannel<GeneralBlob> {
  public:
   typedef std::vector<paddle::PaddleTensor> TensorVector;
 
   DECLARE_OP(GeneralInferOp);
 
   int inference();
+
 };
 
 }  // namespace serving
diff --git a/core/general-server/op/general_reader_op.cpp b/core/general-server/op/general_reader_op.cpp
index 3a4aa72baac753423bf126358c72b50352a2531d..3020dac3bde5ed484b3db4870f35d025ae6a2396 100644
--- a/core/general-server/op/general_reader_op.cpp
+++ b/core/general-server/op/general_reader_op.cpp
@@ -16,6 +16,7 @@
 #include <iostream>
 #include <memory>
 #include <sstream>
+#include "core/general-server/op/general_infer_helper.h"
 #include "core/general-server/op/general_reader_op.h"
 #include "core/predictor/framework/infer.h"
 #include "core/predictor/framework/memory.h"
@@ -77,16 +78,12 @@ int GeneralReaderOp::inference() {
   std::vector<int64_t> elem_size;
   std::vector<int64_t> capacity;
 
-  GeneralReaderOutput *res = mutable_data<GeneralReaderOutput>();
-  TensorVector *in = &res->tensor_vector;
+  GeneralBlob *res = mutable_data<GeneralBlob>();
+  TensorVector *out = &res->tensor_vector;
 
   if (!res) {
     LOG(ERROR) << "Failed get op tls reader object output";
   }
-  if (batch_size <= 0) {
-    res->reader_status = -1;
-    return 0;
-  }
 
   int var_num = req->insts(0).tensor_array_size();
   VLOG(2) << "var num: " << var_num;
@@ -102,9 +99,9 @@ int GeneralReaderOp::inference() {
 
   VLOG(2) << "print general model config done.";
 
-  // check
-  res->reader_status = conf_check(req, model_config);
-  if (res->reader_status != 0) {
+  // TODO(guru4elephant): how to do conditional check?
+  int ret = conf_check(req, model_config);
+  if (ret != 0) {
     LOG(INFO) << "model conf of server:";
     resource.print_general_model_config(model_config);
     return 0;
@@ -142,26 +139,26 @@ int GeneralReaderOp::inference() {
       VLOG(2) << "var[" << i << "] is tensor, capacity: " << capacity[i];
     }
     lod_tensor.name = model_config->_feed_name[i];
-    in->push_back(lod_tensor);
+    out->push_back(lod_tensor);
   }
 
   for (int i = 0; i < var_num; ++i) {
-    if (in->at(i).lod.size() == 1) {
+    if (out->at(i).lod.size() == 1) {
       for (int j = 0; j < batch_size; ++j) {
         const Tensor &tensor = req->insts(j).tensor_array(i);
         int data_len = tensor.data_size();
         VLOG(2) << "tensor size for var[" << i << "]: " << tensor.data_size();
-        int cur_len = in->at(i).lod[0].back();
+        int cur_len = out->at(i).lod[0].back();
         VLOG(2) << "current len: " << cur_len;
-        in->at(i).lod[0].push_back(cur_len + data_len);
+        out->at(i).lod[0].push_back(cur_len + data_len);
         VLOG(2) << "new len: " << cur_len + data_len;
       }
-      in->at(i).data.Resize(in->at(i).lod[0].back() * elem_size[i]);
-      in->at(i).shape = {in->at(i).lod[0].back(), 1};
+      out->at(i).data.Resize(out->at(i).lod[0].back() * elem_size[i]);
+      out->at(i).shape = {out->at(i).lod[0].back(), 1};
       VLOG(2) << "var[" << i
-              << "] is lod_tensor and len=" << in->at(i).lod[0].back();
+              << "] is lod_tensor and len=" << out->at(i).lod[0].back();
     } else {
-      in->at(i).data.Resize(batch_size * capacity[i] * elem_size[i]);
+      out->at(i).data.Resize(batch_size * capacity[i] * elem_size[i]);
       VLOG(2) << "var[" << i
               << "] is tensor and capacity=" << batch_size * capacity[i];
     }
@@ -169,29 +166,29 @@ int GeneralReaderOp::inference() {
 
   for (int i = 0; i < var_num; ++i) {
     if (elem_type[i] == 0) {
-      int64_t *dst_ptr = static_cast<int64_t *>(in->at(i).data.data());
+      int64_t *dst_ptr = static_cast<int64_t *>(out->at(i).data.data());
       int offset = 0;
       for (int j = 0; j < batch_size; ++j) {
         for (int k = 0; k < req->insts(j).tensor_array(i).data_size(); ++k) {
           dst_ptr[offset + k] =
               *(const int64_t *)req->insts(j).tensor_array(i).data(k).c_str();
         }
-        if (in->at(i).lod.size() == 1) {
-          offset = in->at(i).lod[0][j + 1];
+        if (out->at(i).lod.size() == 1) {
+          offset = out->at(i).lod[0][j + 1];
         } else {
           offset += capacity[i];
         }
       }
     } else {
-      float *dst_ptr = static_cast<float *>(in->at(i).data.data());
+      float *dst_ptr = static_cast<float *>(out->at(i).data.data());
       int offset = 0;
       for (int j = 0; j < batch_size; ++j) {
         for (int k = 0; k < req->insts(j).tensor_array(i).data_size(); ++k) {
           dst_ptr[offset + k] =
               *(const float *)req->insts(j).tensor_array(i).data(k).c_str();
         }
-        if (in->at(i).lod.size() == 1) {
-          offset = in->at(i).lod[0][j + 1];
+        if (out->at(i).lod.size() == 1) {
+          offset = out->at(i).lod[0][j + 1];
         } else {
           offset += capacity[i];
         }
diff --git a/core/general-server/op/general_reader_op.h b/core/general-server/op/general_reader_op.h
index 4c68d70c37e79bf86838551d899f6cc25b2be923..137fad98083ff6e136ea0446bd0c985a556b62de 100644
--- a/core/general-server/op/general_reader_op.h
+++ b/core/general-server/op/general_reader_op.h
@@ -25,6 +25,7 @@
 #endif
 #include <string>
 #include "core/predictor/framework/resource.h"
+#include "core/general-server/op/general_infer_helper.h"
 #include "core/general-server/general_model_service.pb.h"
 #include "core/general-server/load_general_model_service.pb.h"
 
@@ -32,28 +33,15 @@ namespace baidu {
 namespace paddle_serving {
 namespace serving {
 
-struct GeneralReaderOutput {
-  std::vector<paddle::PaddleTensor> tensor_vector;
-  int reader_status = 0;
-
-  void Clear() {
-    size_t tensor_count = tensor_vector.size();
-    for (size_t ti = 0; ti < tensor_count; ++ti) {
-      tensor_vector[ti].shape.clear();
-    }
-    tensor_vector.clear();
-  }
-  std::string ShortDebugString() const { return "Not implemented!"; }
-};
-
 class GeneralReaderOp : public baidu::paddle_serving::predictor::OpWithChannel<
-                            GeneralReaderOutput> {
+                            GeneralBlob> {
  public:
   typedef std::vector<paddle::PaddleTensor> TensorVector;
 
   DECLARE_OP(GeneralReaderOp);
 
   int inference();
+
 };
 
 }  // namespace serving
diff --git a/core/general-server/op/general_response_op.cpp b/core/general-server/op/general_response_op.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..39624dcd7bb9455f1268c5d2d464b02fdeb16be4
--- /dev/null
+++ b/core/general-server/op/general_response_op.cpp
@@ -0,0 +1,128 @@
+// Copyright (c) 2020 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.
+
+#include <algorithm>
+#include <iostream>
+#include <memory>
+#include <sstream>
+#include "core/general-server/op/general_infer_helper.h"
+#include "core/general-server/op/general_response_op.h"
+#include "core/predictor/framework/infer.h"
+#include "core/predictor/framework/memory.h"
+#include "core/predictor/framework/resource.h"
+#include "core/util/include/timer.h"
+
+namespace baidu {
+namespace paddle_serving {
+namespace serving {
+
+using baidu::paddle_serving::Timer;
+using baidu::paddle_serving::predictor::MempoolWrapper;
+using baidu::paddle_serving::predictor::general_model::Tensor;
+using baidu::paddle_serving::predictor::general_model::Response;
+using baidu::paddle_serving::predictor::general_model::Request;
+using baidu::paddle_serving::predictor::general_model::FetchInst;
+using baidu::paddle_serving::predictor::InferManager;
+using baidu::paddle_serving::predictor::PaddleGeneralModelConfig;
+
+int GeneralResponseOp::inference() {
+  const GeneralBlob *input_blob =
+      get_depend_argument<GeneralBlob>(pre_name());
+
+  if (!input_blob) {
+    LOG(ERROR) << "Failed mutable depended argument, op: "
+               << pre_name();
+    return -1;
+  }
+
+  const TensorVector *in = &input_blob->tensor_vector;
+  int batch_size = input_blob->GetBatchSize();
+
+  VLOG(2) << "input batch size: " << batch_size;
+
+  const Request *req = dynamic_cast<const Request *>(get_request_message());
+
+  VLOG(2) << "start to call load general model_conf op";
+  baidu::paddle_serving::predictor::Resource &resource =
+      baidu::paddle_serving::predictor::Resource::instance();
+  
+  VLOG(2) << "get resource pointer done.";
+  std::shared_ptr<PaddleGeneralModelConfig> model_config =
+      resource.get_general_model_config();
+
+  std::vector<int> fetch_index;
+  fetch_index.resize(req->fetch_var_names_size());
+  for (int i = 0; i < req->fetch_var_names_size(); ++i) {
+    fetch_index[i] =
+        model_config->_fetch_alias_name_to_index[req->fetch_var_names(i)];
+  }
+  
+  // response inst with only fetch_var_names
+  Response *res = mutable_data<Response>();
+
+  // res->set_mean_infer_us(infer_time);
+
+  for (int i = 0; i < batch_size; ++i) {
+    FetchInst *fetch_inst = res->add_insts();
+    for (auto & idx : fetch_index) {
+      Tensor *tensor = fetch_inst->add_tensor_array();
+      // currently only response float tensor or lod_tensor
+      tensor->set_elem_type(1);
+      if (model_config->_is_lod_fetch[idx]) {
+        VLOG(2) << "out[" << idx << " is lod_tensor";
+        tensor->add_shape(-1);
+      } else {
+        VLOG(2) << "out[" << idx << "] is tensor";
+        for (int k = 1; k < in->at(idx).shape.size(); ++k) {
+          VLOG(2) << "shape[" << k - 1 << "]: "
+                  << in->at(idx).shape[k];
+          tensor->add_shape(in->at(idx).shape[k]);
+        }
+      }
+    }
+  }
+
+  int var_idx = 0;
+  for (auto & idx : fetch_index) {
+    float *data_ptr = static_cast<float *>(in->at(idx).data.data());
+    int cap = 1;
+    for (int j = 1; j < in->at(idx).shape.size(); ++j) {
+      cap *= in->at(idx).shape[j];
+    }
+    if (model_config->_is_lod_fetch[idx]) {
+      for (int j = 0; j < batch_size; ++j) {
+        for (int k = in->at(idx).lod[0][j];
+             k < in->at(idx).lod[0][j + 1]; k++) {
+          res->mutable_insts(j)->mutable_tensor_array(var_idx)->add_data(
+              reinterpret_cast<char *>(&(data_ptr[k])), sizeof(float));
+        }
+      }
+    } else {
+      for (int j = 0; j < batch_size; ++j) {
+        for (int k = j * cap; k < (j + 1) * cap; ++k) {
+          res->mutable_insts(j)->mutable_tensor_array(var_idx)->add_data(
+              reinterpret_cast<char *>(&(data_ptr[k])), sizeof(float));
+        }
+      }
+    }
+    var_idx++;
+  }
+  return 0;
+}
+
+DEFINE_OP(GeneralResponseOp);
+
+}  // namespace serving
+}  // namespace paddle_serving
+}  // namespace baidu
diff --git a/core/general-server/op/general_text_infer_op.h b/core/general-server/op/general_response_op.h
similarity index 94%
rename from core/general-server/op/general_text_infer_op.h
rename to core/general-server/op/general_response_op.h
index 5c94a205f8fc03cb8b4d23bb556a8755b7cb55ea..95b9f7708df82dc1ce750cb4067b79c8ca60fd05 100644
--- a/core/general-server/op/general_text_infer_op.h
+++ b/core/general-server/op/general_response_op.h
@@ -13,6 +13,7 @@
 // limitations under the License.
 
 #pragma once
+#include <string>
 #include <vector>
 #ifdef BCLOUD
 #ifdef WITH_GPU
@@ -29,15 +30,16 @@ namespace baidu {
 namespace paddle_serving {
 namespace serving {
 
-class GeneralTextInferOp
+class GeneralResponseOp
     : public baidu::paddle_serving::predictor::OpWithChannel<
           baidu::paddle_serving::predictor::general_model::Response> {
  public:
   typedef std::vector<paddle::PaddleTensor> TensorVector;
 
-  DECLARE_OP(GeneralTextInferOp);
+  DECLARE_OP(GeneralResponseOp);
 
   int inference();
+
 };
 
 }  // namespace serving
diff --git a/core/general-server/op/general_text_reader_op.cpp b/core/general-server/op/general_text_reader_op.cpp
index 9e3c489f6557d6d5e9931ca317718e5f4e3e3683..bc6d96a7bb507dcc1c74dac28bfe9a908067ffed 100644
--- a/core/general-server/op/general_text_reader_op.cpp
+++ b/core/general-server/op/general_text_reader_op.cpp
@@ -42,7 +42,7 @@ int GeneralTextReaderOp::inference() {
   std::vector<int64_t> elem_size;
   std::vector<int64_t> capacity;
 
-  GeneralTextReaderOutput *res = mutable_data<GeneralTextReaderOutput>();
+  GeneralBlob *res = mutable_data<GeneralBlob>();
   TensorVector *in = &res->tensor_vector;
 
   if (!res) {
@@ -50,8 +50,8 @@ int GeneralTextReaderOp::inference() {
   }
 
   if (batch_size <= 0) {
-    res->reader_status = -1;
-    return 0;
+    LOG(ERROR) << "Batch size < 0";
+    return -1;
   }
 
   int var_num = req->insts(0).tensor_array_size();
diff --git a/core/general-server/op/general_text_reader_op.h b/core/general-server/op/general_text_reader_op.h
index e7f484a9915609887c2a6593ff1ad0655fc4789c..80573a15cbbacf0d2682ea1b225ef7732d54e9ad 100644
--- a/core/general-server/op/general_text_reader_op.h
+++ b/core/general-server/op/general_text_reader_op.h
@@ -25,6 +25,7 @@
 #endif
 #include <string>
 #include "core/predictor/framework/resource.h"
+#include "core/general-server/op/general_infer_helper.h"
 #include "core/general-server/general_model_service.pb.h"
 #include "core/general-server/load_general_model_service.pb.h"
 
@@ -32,23 +33,8 @@ namespace baidu {
 namespace paddle_serving {
 namespace serving {
 
-struct GeneralTextReaderOutput {
-  std::vector<paddle::PaddleTensor> tensor_vector;
-  int reader_status = 0;
-
-  void Clear() {
-    size_t tensor_count = tensor_vector.size();
-    for (size_t ti = 0; ti < tensor_count; ++ti) {
-      tensor_vector[ti].shape.clear();
-    }
-    tensor_vector.clear();
-  }
-  std::string ShortDebugString() const { return "Not implemented!"; }
-};
-
 class GeneralTextReaderOp :
-    public baidu::paddle_serving::predictor::OpWithChannel<
-    GeneralTextReaderOutput> {
+    public baidu::paddle_serving::predictor::OpWithChannel<GeneralBlob> {
  public:
   typedef std::vector<paddle::PaddleTensor> TensorVector;
 
diff --git a/core/general-server/op/general_text_infer_op.cpp b/core/general-server/op/general_text_response_op.cpp
similarity index 66%
rename from core/general-server/op/general_text_infer_op.cpp
rename to core/general-server/op/general_text_response_op.cpp
index 79e671047f3bdd026a1a33cfbc056e5775ed6a68..16f476353965384c0d2b0092f2a42efa9c5289e7 100644
--- a/core/general-server/op/general_text_infer_op.cpp
+++ b/core/general-server/op/general_text_response_op.cpp
@@ -16,10 +16,7 @@
 #include <iostream>
 #include <memory>
 #include <sstream>
-#include "core/general-server/op/general_text_infer_op.h"
-#include "core/general-server/op/general_infer_op.h"
-#include "core/general-server/op/general_text_reader_op.h"
-#include "core/general-server/op/general_reader_op.h"
+#include "core/general-server/op/general_text_response_op.h"
 #include "core/predictor/framework/infer.h"
 #include "core/predictor/framework/memory.h"
 #include "core/predictor/framework/resource.h"
@@ -29,7 +26,6 @@ namespace baidu {
 namespace paddle_serving {
 namespace serving {
 
-using baidu::paddle_serving::serving::GENERAL_MODEL_NAME;
 using baidu::paddle_serving::Timer;
 using baidu::paddle_serving::predictor::MempoolWrapper;
 using baidu::paddle_serving::predictor::general_model::Tensor;
@@ -39,40 +35,21 @@ using baidu::paddle_serving::predictor::general_model::FetchInst;
 using baidu::paddle_serving::predictor::InferManager;
 using baidu::paddle_serving::predictor::PaddleGeneralModelConfig;
 
-int GeneralTextInferOp::inference() {
-  const GeneralTextReaderOutput *reader_out =
-      get_depend_argument<GeneralTextReaderOutput>("general_text_reader_op");
-  if (!reader_out) {
-    LOG(ERROR) << "Failed mutable depended argument, op:"
-               << "general_text_reader_op";
-    return -1;
-  }
+int GeneralTextResponseOp::inference() {
+  const GeneralBlob *input_blob =
+      get_depend_argument<GeneralBlob>(pre_name());
 
-  int reader_status = reader_out->reader_status;
-  if (reader_status != 0) {
-    LOG(ERROR) << "Read request wrong.";
+  if (!input_blob) {
+    LOG(ERROR) << "Failed mutable depended argument, op: "
+               << pre_name();
     return -1;
   }
 
-  const TensorVector *in = &reader_out->tensor_vector;
-  TensorVector *out = butil::get_object<TensorVector>();
-  int batch_size = 0;
-  if (in->at(0).lod.size() == 1) {
-    batch_size = in->at(0).lod[0].size() - 1;
-  } else {
-    batch_size = in->at(0).shape[0];
-  }
+  const TensorVector *in = &input_blob->tensor_vector;
+  int batch_size = input_blob->GetBatchSize();
+
   VLOG(2) << "infer batch size: " << batch_size;
   // infer
-  Timer timeline;
-  double infer_time = 0.0;
-  timeline.Start();
-  if (InferManager::instance().infer(GENERAL_MODEL_NAME, in, out, batch_size)) {
-    LOG(ERROR) << "Failed do infer in fluid model: " << GENERAL_MODEL_NAME;
-    return -1;
-  }
-  timeline.Pause();
-  infer_time = timeline.ElapsedUS();
 
   const Request *req = dynamic_cast<const Request *>(get_request_message());
 
@@ -94,7 +71,7 @@ int GeneralTextInferOp::inference() {
   // response inst with only fetch_var_names
   Response *res = mutable_data<Response>();
 
-  res->set_mean_infer_us(infer_time);
+  // res->set_mean_infer_us(infer_time);
 
   for (int i = 0; i < batch_size; ++i) {
     FetchInst *fetch_inst = res->add_insts();
@@ -107,10 +84,10 @@ int GeneralTextInferOp::inference() {
         tensor->add_shape(-1);
       } else {
         VLOG(2) << "out[" << idx << "] is tensor";
-        for (int k = 1; k < out->at(idx).shape.size(); ++k) {
+        for (int k = 1; k < in->at(idx).shape.size(); ++k) {
           VLOG(2) << "shape[" << k - 1 << "]: "
-                  << out->at(idx).shape[k];
-          tensor->add_shape(out->at(idx).shape[k]);
+                  << in->at(idx).shape[k];
+          tensor->add_shape(in->at(idx).shape[k]);
         }
       }
     }
@@ -118,15 +95,15 @@ int GeneralTextInferOp::inference() {
 
   int var_idx = 0;
   for (auto & idx : fetch_index) {
-    float *data_ptr = static_cast<float *>(out->at(idx).data.data());
+    float *data_ptr = static_cast<float *>(in->at(idx).data.data());
     int cap = 1;
-    for (int j = 1; j < out->at(idx).shape.size(); ++j) {
-      cap *= out->at(idx).shape[j];
+    for (int j = 1; j < in->at(idx).shape.size(); ++j) {
+      cap *= in->at(idx).shape[j];
     }
     if (model_config->_is_lod_fetch[idx]) {
       for (int j = 0; j < batch_size; ++j) {
-        for (int k = out->at(idx).lod[0][j];
-             k < out->at(idx).lod[0][j + 1]; k++) {
+        for (int k = in->at(idx).lod[0][j];
+             k < in->at(idx).lod[0][j + 1]; k++) {
           res->mutable_insts(j)->mutable_tensor_array(var_idx)->add_float_data(
               data_ptr[k]);
         }
@@ -143,7 +120,7 @@ int GeneralTextInferOp::inference() {
   }
   return 0;
 }
-DEFINE_OP(GeneralTextInferOp);
+DEFINE_OP(GeneralTextResponseOp);
 
 }  // namespace serving
 }  // namespace paddle_serving
diff --git a/core/general-server/op/general_text_response_op.h b/core/general-server/op/general_text_response_op.h
new file mode 100644
index 0000000000000000000000000000000000000000..5efefefb77e03f73d321cb1f2c91c7e183cb5a6b
--- /dev/null
+++ b/core/general-server/op/general_text_response_op.h
@@ -0,0 +1,48 @@
+// 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
+#include <string>
+#include <vector>
+#ifdef BCLOUD
+#ifdef WITH_GPU
+#include "paddle/paddle_inference_api.h"
+#else
+#include "paddle/fluid/inference/api/paddle_inference_api.h"
+#endif
+#else
+#include "paddle_inference_api.h"  // NOLINT
+#endif
+#include "core/general-server/general_model_service.pb.h"
+#include "core/general-server/op/general_infer_helper.h"
+
+namespace baidu {
+namespace paddle_serving {
+namespace serving {
+
+class GeneralTextResponseOp
+    : public baidu::paddle_serving::predictor::OpWithChannel<
+          baidu::paddle_serving::predictor::general_model::Response> {
+ public:
+  typedef std::vector<paddle::PaddleTensor> TensorVector;
+
+  DECLARE_OP(GeneralTextResponseOp);
+
+  int inference();
+
+};
+
+}  // namespace serving
+}  // namespace paddle_serving
+}  // namespace baidu
diff --git a/core/predictor/framework/dag_view.cpp b/core/predictor/framework/dag_view.cpp
index fe68ddf98df97ede819b41c0ed6d974c1b4e31f6..42a61b0885b7ecd9c4061c8bde24879d998a1ec1 100644
--- a/core/predictor/framework/dag_view.cpp
+++ b/core/predictor/framework/dag_view.cpp
@@ -45,6 +45,8 @@ int DagView::init(Dag* dag, const std::string& service_name) {
                  << "at:" << si;
       return ERR_MEM_ALLOC_FAILURE;
     }
+    VLOG(2) << "stage[" << si << "] name: " <<  stage->full_name;
+    VLOG(2) << "stage[" << si << "] node size: " << stage->nodes.size();
     vstage->full_name = service_name + NAME_DELIMITER + stage->full_name;
     uint32_t node_size = stage->nodes.size();
     // create tls view node
@@ -63,16 +65,30 @@ int DagView::init(Dag* dag, const std::string& service_name) {
       }
 
       // initialize a TLS op object
+      VLOG(2) << "dag view initialized: \n"
+              << "node id: " << node->id << "\n"
+              << "node name: " << node->name << "\n"
+              << "node type: " << node->type;
       if (op->init(_bus, dag, node->id, node->name, node->type, node->conf) !=
           0) {
         LOG(WARNING) << "Failed init op, type:" << node->type;
         return ERR_INTERNAL_FAILURE;
       }
+      
       op->set_full_name(service_name + NAME_DELIMITER + node->full_name);
       vnode->conf = node;
       vnode->op = op;
       vstage->nodes.push_back(vnode);
     }
+    // TODO(guru4elephant): this seems buggy, please review later
+    if (si > 0) {
+      VLOG(2) << "set op pre name: \n"
+              << "current op name: " << vstage->nodes.back()->op->op_name()
+              << " previous op name: "
+              << _view[si-1]->nodes.back()->op->op_name();
+      vstage->nodes.back()->op->set_pre_node_name(
+          _view[si-1]->nodes.back()->op->op_name());
+    }
     _view.push_back(vstage);
   }
 
diff --git a/core/predictor/op/op.cpp b/core/predictor/op/op.cpp
index ed3e80fb4439ccdb844aaa72cb8c0f7839d0cff0..d2e512eb69af0b70cbe07b5bc75c3acb88fea918 100644
--- a/core/predictor/op/op.cpp
+++ b/core/predictor/op/op.cpp
@@ -127,6 +127,7 @@ int Op::process(bool debug) {
           return -1;
       }
   }*/
+
   if (debug && _timer) {
     _timer->check("depend");
   }
diff --git a/core/predictor/op/op.h b/core/predictor/op/op.h
index 279744aebd509635aa76e0e26b4f0695c370d22d..84bcf44575826a6ab00e037ce57e119ffbe4f3f3 100644
--- a/core/predictor/op/op.h
+++ b/core/predictor/op/op.h
@@ -128,10 +128,18 @@ class Op {
 
   const char* name() const;
 
+  const std::string& op_name() const { return _name; }
+
   const std::string& full_name() const { return _full_name; }
 
+  const std::string& pre_name() const { return _pre_node_name; }
+
   void set_full_name(const std::string full_name) { _full_name = full_name; }
 
+  void set_pre_node_name(const std::string pre_name) {
+    _pre_node_name = pre_name;
+  }
+
   const std::string& type() const;
 
   uint32_t id() const;
@@ -181,6 +189,7 @@ class Op {
   Bus* _bus;
   Dag* _dag;
   uint32_t _id;
+  std::string _pre_node_name;  // only for sequential execution
   std::string _name;
   std::string _full_name;  // service_workflow_stageindex_opname
   std::string _type;
diff --git a/go/client_app/imdb_client.go b/go/client_app/imdb_client.go
index f6ad12048e81bdad80b877325c17972b2481cf7a..aef823ed2c5209217d4f60f93d19006e67dca35d 100644
--- a/go/client_app/imdb_client.go
+++ b/go/client_app/imdb_client.go
@@ -21,7 +21,7 @@ import (
        "bufio"
        "strconv"
        "os"
-       "serving_client"
+       serving_client "github.com/PaddlePaddle/Serving/go/serving_client"
 )
 
 func main() {
diff --git a/python/paddle_serving_server/__init__.py b/python/paddle_serving_server/__init__.py
index 458a3da5e02a9799eb042674708e994c98bc6701..f8cf66d7b775eaa954a451147b811b7b29b7fe1b 100644
--- a/python/paddle_serving_server/__init__.py
+++ b/python/paddle_serving_server/__init__.py
@@ -23,12 +23,15 @@ from version import serving_server_version
 
 class OpMaker(object):
     def __init__(self):
-        self.op_dict = {"general_infer":"GeneralInferOp",
-                        "general_text_infer":"GeneralTextInferOp",
-                        "general_reader":"GeneralReaderOp",
-                        "general_text_reader":"GeneralTextReaderOp",
-                        "general_single_kv":"GeneralSingleKVOp",
-                        "general_dist_kv":"GeneralDistKVOp"}
+        self.op_dict = {
+            "general_infer":"GeneralInferOp",
+            "general_reader":"GeneralReaderOp",
+            "general_response":"GeneralResponseOp",
+            "general_text_reader":"GeneralTextReaderOp",
+            "general_text_response":"GeneralTextResponseOp",
+            "general_single_kv":"GeneralSingleKVOp",
+            "general_dist_kv":"GeneralDistKVOp"
+        }
 
     # currently, inputs and outputs are not used
     # when we have OpGraphMaker, inputs and outputs are necessary
diff --git a/python/paddle_serving_server_gpu/__init__.py b/python/paddle_serving_server_gpu/__init__.py
index a5b584ba18dd9cb4fc38b8f603c6e6a835bb1444..65abb6728f9a5d9560f4c7f99c2792ed9dd9e95c 100644
--- a/python/paddle_serving_server_gpu/__init__.py
+++ b/python/paddle_serving_server_gpu/__init__.py
@@ -24,10 +24,13 @@ from version import serving_server_version
 class OpMaker(object):
     def __init__(self):
         self.op_dict = {
-            "general_infer": "GeneralInferOp",
-            "general_reader": "GeneralReaderOp",
-            "general_single_kv": "GeneralSingleKVOp",
-            "general_dist_kv": "GeneralDistKVOp"
+            "general_infer":"GeneralInferOp",
+            "general_reader":"GeneralReaderOp",
+            "general_response":"GeneralResponseOp",
+            "general_text_reader":"GeneralTextReaderOp",
+            "general_text_response":"GeneralTextResponseOp",
+            "general_single_kv":"GeneralSingleKVOp",
+            "general_dist_kv":"GeneralDistKVOp"
         }
 
     # currently, inputs and outputs are not used