diff --git a/src/framework/executor.cpp b/src/framework/executor.cpp
index 1cbae18e7ee32223f815c813975a4f5c29c48749..8c3fa0364c8310795a10bb36b6d2eb9f35df5a53 100644
--- a/src/framework/executor.cpp
+++ b/src/framework/executor.cpp
@@ -170,20 +170,19 @@ void Executor<Device, T>::InitMemory() {
   for (const auto &block : program_desc_->Blocks()) {
     for (const auto &var_desc : block->Vars()) {
       auto var = program_.scope->Var(var_desc->Name());
-      auto tensor = var->template GetMutable<LoDTensor>();
       if (var_desc->Persistable()) {
         if (var_desc->Name() == "feed" || var_desc->Name() == "fetch") {
+          var->template GetMutable<framework::LoDTensorArray>();
           continue;
         }
         char *origin_data =
             ReadFileToBuff(program_.model_path + "/" + var_desc->Name());
         char *data = origin_data;
+        auto tensor = var->template GetMutable<LoDTensor>();
         LoadMemory(reinterpret_cast<void **>(&data), var_desc, tensor);
         delete[] origin_data;
       } else {
-        if (var_desc->Type() == VARTYPE_TYPE_LOD_TENSOR) {
-          varInputMemory(var_desc, var, tensor);
-        }
+        varInputMemory(var_desc, var);
       }
     }
   }
@@ -205,23 +204,18 @@ void Executor<Device, T>::InitCombineMemory() {
   for (const auto &block : program_desc_->Blocks()) {
     for (const auto &var_desc : block->Vars()) {
       auto var = program_.scope->Var(var_desc->Name());
-      auto tensor = var->template GetMutable<LoDTensor>();
       if (var_desc->Persistable()) {
         if (var_desc->Name() == "feed" || var_desc->Name() == "fetch") {
+          var->template GetMutable<framework::LoDTensorArray>();
           continue;
         }
 
         DLOG << " init combine memory persistable: " << var_desc->Name();
-
+        auto tensor = var->template GetMutable<LoDTensor>();
         LoadMemory(reinterpret_cast<void **>(&data), var_desc, tensor);
       } else {
-        if (var_desc->Type() == VARTYPE_TYPE_LOD_TENSOR) {
-          DLOG << " init combine memory no persistable in lod: "
-               << var_desc->Name();
-          varInputMemory(var_desc, var, tensor);
-        } else {
-          DLOG << " init combine memory no persistable: " << var_desc->Name();
-        }
+        DLOG << " init combine memory no persistable: " << var_desc->Name();
+        varInputMemory(var_desc, var);
       }
     }
   }
@@ -239,6 +233,7 @@ void Executor<Device, T>::InitNoPersistableMemory(const Tensor &input_tensor) {
       auto tensor = var->template GetMutable<LoDTensor>();
       if (var_desc->Persistable()) {
         if (var_desc->Name() == "feed" || var_desc->Name() == "fetch") {
+          var->template GetMutable<framework::LoDTensorArray>();
           continue;
         }
       } else {
@@ -249,6 +244,9 @@ void Executor<Device, T>::InitNoPersistableMemory(const Tensor &input_tensor) {
                          input_tensor.dims()[3]});
           tensor->Resize(new_dim);
           tensor->template mutable_data<T>();
+        } else {
+          PADDLE_MOBILE_THROW_EXCEPTION("Unsupported var type `%d`",
+                                        var_desc->Type());
         }
       }
     }
@@ -261,34 +259,43 @@ void Executor<Device, T>::InitNoPersistableMemory(const Tensor &input_tensor) {
 
 template <typename Device, typename T>
 bool Executor<Device, T>::varInputMemory(
-    const std::shared_ptr<VarDesc> &var_desc, Variable *var,
-    LoDTensor *tensor) const {
+    const std::shared_ptr<VarDesc> &var_desc, Variable *var) const {
 #ifdef PADDLE_MOBILE_FPGA
   tensor->init(typeid(float));
   return true;
 #endif
-  auto type = var_desc->Tensor_desc().DataType();
-  switch (type) {
-    case VARTYPE_TYPE_FP32:
-      tensor->mutable_data<float>();
-      break;
-    case VARTYPE_TYPE_INT8:
-      tensor->mutable_data<int8_t>();
-      break;
-    case VARTYPE_TYPE_INT32:
-      tensor->mutable_data<int32_t>();
-      break;
-    case VARTYPE_TYPE_INT64:
-      tensor->mutable_data<int64_t>();
-      break;
-    default:
-      break;
+  auto TypeId = [](const VarType_Type &type) -> std::type_index {
+    switch (type) {
+      case VARTYPE_TYPE_BOOL:
+        return typeid(bool);
+      case VARTYPE_TYPE_FP32:
+        return typeid(float);
+      case VARTYPE_TYPE_INT8:
+        return typeid(int8_t);
+      case VARTYPE_TYPE_INT32:
+        return typeid(int);
+      case VARTYPE_TYPE_INT64:
+        return typeid(int64_t);
+      default:
+        PADDLE_MOBILE_THROW_EXCEPTION("got unhandled var type `%d`", type);
+    }
+  };
+
+  auto type = var_desc->Type();
+  if (type == VARTYPE_TYPE_LOD_TENSOR) {
+    auto data_type = var_desc->Tensor_desc().DataType();
+    framework::LoDTensor *tensor = var->template GetMutable<LoDTensor>();
+    tensor->mutable_data(TypeId(data_type));
+  } else if (type == VARTYPE_TYPE_STEP_SCOPES) {
+    std::vector<framework::Scope *> *step_scopes =
+        var->template GetMutable<std::vector<framework::Scope *>>();
+  } else if (type == VARTYPE_TYPE_STEP_LOD_TENSOR_ARRAY) {
+    framework::LoDTensorArray *tensor_array =
+        var->template GetMutable<framework::LoDTensorArray>();
+  } else {
+    PADDLE_MOBILE_THROW_EXCEPTION("got unhandled var type `%d`", type);
   }
-  bool is_mute_match =
-      (type == VARTYPE_TYPE_FP32) || (type == VARTYPE_TYPE_INT8) ||
-      (type == VARTYPE_TYPE_INT32) || (type == VARTYPE_TYPE_INT64);
-  PADDLE_MOBILE_ENFORCE(is_mute_match, "got unhandled data type : %d", type);
-  return is_mute_match;
+  return true;
 }
 
 template <typename Device, typename T>
diff --git a/src/framework/executor.h b/src/framework/executor.h
index 2c2af1f9814b48b9264b13f01868c1e998c73701..b9692db388b384b2336b224a8cf19854df61041d 100644
--- a/src/framework/executor.h
+++ b/src/framework/executor.h
@@ -61,8 +61,8 @@ class Executor {
  protected:
   Executor() = default;
 
-  bool varInputMemory(const std::shared_ptr<VarDesc> &var_desc, Variable *var,
-                      LoDTensor *tensor) const;
+  bool varInputMemory(const std::shared_ptr<VarDesc> &var_desc,
+                      Variable *var) const;
   void InitMemory();
   void InitCombineMemory();
   void InitNoPersistableMemory(const Tensor &input_tensor);
diff --git a/src/framework/load_ops.h b/src/framework/load_ops.h
index 3b214a52f1314202d183b871784bebae0b6ec795..95524a76760359a5f543220bf4365f2778d32090 100644
--- a/src/framework/load_ops.h
+++ b/src/framework/load_ops.h
@@ -324,3 +324,6 @@ LOAD_OP1(psroi_pool, CPU);
 #ifdef ROI_PERSPECTIVE_OP
 LOAD_OP1(roi_perspective_transform, CPU);
 #endif
+#ifdef BEAM_SEARCH_DECODE_OP
+LOAD_OP1(beam_search_decode, CPU);
+#endif
diff --git a/src/framework/operator.cpp b/src/framework/operator.cpp
index 611b134eaab7376dfba9ef3294f8fa14bf13e0da..4d68b8477febd967800bca9eb0334a85843b40cf 100644
--- a/src/framework/operator.cpp
+++ b/src/framework/operator.cpp
@@ -64,9 +64,10 @@ void OperatorBase<Dtype>::Run() {
   for (const auto key : input_keys) {
     auto var_vec_in = inputs_.at(key);
     for (int i = 0; i < var_vec_in.size(); ++i) {
-      auto vari = this->scope_->FindVar(var_vec_in[i]);
-      if (vari->IsInitialized()) {
-        const Tensor *tensor = vari->template Get<framework::LoDTensor>();
+      auto var = this->scope_->FindVar(var_vec_in[i]);
+      if (var->IsInitialized() &&
+          var->template IsType<framework::LoDTensor>()) {
+        const Tensor *tensor = var->template Get<framework::LoDTensor>();
         if (tensor) DLOG << type_ << " input- " << key << "=" << *tensor;
       }
     }
@@ -74,9 +75,10 @@ void OperatorBase<Dtype>::Run() {
   for (const auto key : GetOutKeys()) {
     auto var_vec_out = outputs_.at(key);
     for (int i = 0; i < var_vec_out.size(); ++i) {
-      auto vari = scope_->FindVar(var_vec_out[i]);
-      if (vari->IsInitialized()) {
-        const Tensor *tensor = vari->template Get<framework::LoDTensor>();
+      auto var = scope_->FindVar(var_vec_out[i]);
+      if (var->IsInitialized() &&
+          var->template IsType<framework::LoDTensor>()) {
+        const Tensor *tensor = var->template Get<framework::LoDTensor>();
         if (tensor) DLOG << type_ << " output- " << key << "=" << *tensor;
       }
     }
diff --git a/src/framework/program/program_desc.cpp b/src/framework/program/program_desc.cpp
index aba0c829e56712282f83dabee2adf98002288432..6866ab9c75cb06ad1af86ab99a32d59dfa7b45f5 100644
--- a/src/framework/program/program_desc.cpp
+++ b/src/framework/program/program_desc.cpp
@@ -78,9 +78,8 @@ void ProgramDesc::Description(std::string header) {
     }
 
     for (const auto &var_desc : block->Vars()) {
+      LOG(kLOG_DEBUG1) << "var name: " << var_desc->Name();
       if (var_desc->Type() == VARTYPE_TYPE_LOD_TENSOR) {
-        LOG(kLOG_DEBUG1) << "var name: " << var_desc->Name();
-
         const TensorDesc &tensor_desc = var_desc->Tensor_desc();
 
         LOG(kLOG_DEBUG2) << "in var tensor desc dims size: "
diff --git a/src/io/paddle_mobile.cpp b/src/io/paddle_mobile.cpp
index 7e8fcb82887dca02a84677aebe2b8a4547338bc9..7ea501fc7582e28180aa464edb950d56e250a741 100644
--- a/src/io/paddle_mobile.cpp
+++ b/src/io/paddle_mobile.cpp
@@ -152,14 +152,14 @@ PMStatus PaddleMobile<Device, T>::Predict() {
 }
 
 template <typename Device, typename T>
-void PaddleMobile<Device, T>::Feed(const framework::Tensor &input,
-                                   const std::string &var_name) {
+void PaddleMobile<Device, T>::Feed(const std::string &var_name,
+                                   const framework::Tensor &input) {
   executor_->SetInput(input, var_name);
 }
 
 template <typename Device, typename T>
-void PaddleMobile<Device, T>::Feed(const framework::LoDTensor &input,
-                                   const std::string &var_name) {
+void PaddleMobile<Device, T>::Feed(const std::string &var_name,
+                                   const framework::LoDTensor &input) {
   executor_->SetInput(input, var_name);
 }
 
diff --git a/src/io/paddle_mobile.h b/src/io/paddle_mobile.h
index 55fcaf3598603bc9adcf9410d529c68063442dc3..b651028f29fa10111ccef334ddf41b9fbec46c1e 100644
--- a/src/io/paddle_mobile.h
+++ b/src/io/paddle_mobile.h
@@ -33,7 +33,7 @@ namespace paddle_mobile {
 template <typename Device, typename T = float>
 class PaddleMobile {
  public:
-  PaddleMobile(PaddleMobileConfigInternal config) : config_(config) {
+  explicit PaddleMobile(PaddleMobileConfigInternal config) : config_(config) {
 #ifndef PADDLE_MOBILE_CL
     bool is_gpu = std::is_same<DeviceType<kGPU_CL>, Device>::value;
     PADDLE_MOBILE_ENFORCE(!is_gpu, "Please recompile with GPU_CL is on");
@@ -69,8 +69,8 @@ class PaddleMobile {
                          const std::vector<int64_t> &dims);
   PMStatus Predict();
 
-  void Feed(const framework::LoDTensor &input, const std::string &var_name);
-  void Feed(const framework::Tensor &input, const std::string &var_name);
+  void Feed(const std::string &var_name, const framework::LoDTensor &input);
+  void Feed(const std::string &var_name, const framework::Tensor &input);
 
   typedef std::shared_ptr<framework::LoDTensor> LoDTensorPtr;
   LoDTensorPtr Fetch(const std::string &var_name);
diff --git a/src/operators/beam_search_decode_op.cpp b/src/operators/beam_search_decode_op.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..410446944ce3bc7f0968ba84ea3445bf709605d6
--- /dev/null
+++ b/src/operators/beam_search_decode_op.cpp
@@ -0,0 +1,37 @@
+/* Copyright (c) 2018 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. */
+
+#ifdef BEAM_SEARCH_DECODE_OP
+
+#pragma once
+
+#include "operators/beam_search_decode_op.h"
+
+namespace paddle_mobile {
+namespace operators {
+
+template <typename Dtype, typename T>
+void BeamSearchDecodeOp<Dtype, T>::InferShape() const {}
+
+}  // namespace operators
+}  // namespace paddle_mobile
+
+namespace ops = paddle_mobile::operators;
+
+#ifdef PADDLE_MOBILE_CPU
+REGISTER_OPERATOR_CPU(beam_search_decode, ops::BeamSearchDecodeOp);
+#endif
+
+namespace ops = paddle_mobile::operators;
+#endif  // BEAM_SEARCH_DECODE_OP
diff --git a/src/operators/beam_search_decode_op.h b/src/operators/beam_search_decode_op.h
new file mode 100644
index 0000000000000000000000000000000000000000..f212959474eade3da0f026bcdb1e3d15ddd30c6d
--- /dev/null
+++ b/src/operators/beam_search_decode_op.h
@@ -0,0 +1,32 @@
+/* Copyright (c) 2018 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. */
+
+#ifdef BEAM_SEARCH_DECODE_OP
+
+#pragma once
+
+#include <string>
+#include "framework/operator.h"
+#include "operators/kernel/beam_search_decode_kernel.h"
+
+namespace paddle_mobile {
+namespace operators {
+
+DECLARE_OPERATOR(BeamSearchDecode, BeamSearchDecodeParam,
+                 BeamSearchDecodeKernel);
+
+}  // namespace operators
+}  // namespace paddle_mobile
+
+#endif  // BEAM_SEARCH_DECODE_OP
diff --git a/src/operators/feed_op.cpp b/src/operators/feed_op.cpp
index 4e496fb51d16c47d801eabada7c36dbdefdd2140..9e0b037c8dff4e4ea27d6f2f3155d06c9ed4821f 100644
--- a/src/operators/feed_op.cpp
+++ b/src/operators/feed_op.cpp
@@ -21,7 +21,8 @@ template <typename DeviceType, typename T>
 void FeedOp<DeviceType, T>::InferShape() const {
   auto out_dims = this->param_.Out()->dims();
   out_dims[0] = this->param_.BatchSize();
-  auto input_dims = this->param_.InputX()->dims();
+  int col = this->param_.Col();
+  auto input_dims = this->param_.InputX()->at(col).dims();
   if (input_dims.size() == 4) {
     this->param_.Out()->Resize(input_dims);
   } else {
diff --git a/src/operators/kernel/arm/beam_search_decode_kernel.cpp b/src/operators/kernel/arm/beam_search_decode_kernel.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e23c67804e3f9178f1410da8cf895227c192bc73
--- /dev/null
+++ b/src/operators/kernel/arm/beam_search_decode_kernel.cpp
@@ -0,0 +1,37 @@
+/* Copyright (c) 2018 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. */
+
+#ifdef BEAM_SEARCH_DECODE_OP
+
+#include "operators/kernel/beam_search_decode_kernel.h"
+
+namespace paddle_mobile {
+namespace operators {
+
+template <>
+bool BeamSearchDecodeKernel<CPU, float>::Init(
+    BeamSearchDecodeParam<CPU> *param) {
+  return true;
+}
+
+template <>
+void BeamSearchDecodeKernel<CPU, float>::Compute(
+    const BeamSearchDecodeParam<CPU> &param) {
+  // TODO(hjchen2)
+}
+
+}  // namespace operators
+}  // namespace paddle_mobile
+
+#endif
diff --git a/src/operators/kernel/arm/feed_kernel.cpp b/src/operators/kernel/arm/feed_kernel.cpp
index 598f6df01b16683f4d6e06f6418a2930a7ec8736..26ea2ac5f7d806aa6e69dfe9697ed84b61347c0e 100644
--- a/src/operators/kernel/arm/feed_kernel.cpp
+++ b/src/operators/kernel/arm/feed_kernel.cpp
@@ -24,8 +24,9 @@ bool FeedKernel<CPU, float>::Init(FeedParam<CPU> *param) {
 
 template <>
 void FeedKernel<CPU, float>::Compute(const FeedParam<CPU> &param) {
-  param.Out()->ShareDataWith(*(param.InputX()));
-  param.Out()->set_lod(param.InputX()->lod());
+  int col = param.Col();
+  param.Out()->ShareDataWith(param.InputX()->at(col));
+  param.Out()->set_lod(param.InputX()->at(col).lod());
 }
 
 template class FeedKernel<CPU, float>;
diff --git a/src/operators/kernel/arm/tensor_array_read_write_kernel.cpp b/src/operators/kernel/arm/tensor_array_read_write_kernel.cpp
index 5d6b86c34c963808e72a05db08940db97b0212b9..5381fe26b9d6fb80887bcb3d5371b526d11530e4 100644
--- a/src/operators/kernel/arm/tensor_array_read_write_kernel.cpp
+++ b/src/operators/kernel/arm/tensor_array_read_write_kernel.cpp
@@ -28,8 +28,9 @@ void WriteToArrayKernel<CPU, float>::Compute(
     const WriteToArrayParam<CPU> &param) {
   int64_t offset = param.index_->data<int64_t>()[0];
   if (offset >= param.output_->size()) {
-    param.output_->resize(offset);
+    param.output_->resize(offset + 1);
   }
+
   framework::LoDTensor *out_tensor = &(param.output_->at(offset));
   out_tensor->set_lod(param.input_->lod());
   if (param.input_->memory_size() > 0) {
diff --git a/src/operators/kernel/arm/while_kernel.cpp b/src/operators/kernel/arm/while_kernel.cpp
index f27a897ffcadbb1ade759f324766ccbfb8dd49d5..ecdfd29d7cc34d0fb39e32dcc079ab62a6784dfd 100644
--- a/src/operators/kernel/arm/while_kernel.cpp
+++ b/src/operators/kernel/arm/while_kernel.cpp
@@ -12,12 +12,46 @@ 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. */
 
+#ifdef WHILE_OP
+
 #include "operators/kernel/while_kernel.h"
+#include "framework/op_registry.h"
+#include "framework/operator.h"
 
 namespace paddle_mobile {
 namespace operators {
 
-#ifdef WHILE_OP
+class StepExecutor {
+  typedef std::shared_ptr<framework::OperatorBase<CPU>> OperatorPtr;
+
+ public:
+  StepExecutor(const framework::BlockDesc *block, framework::Scope *scope)
+      : scope_(std::shared_ptr<framework::Scope>(scope)) {
+    std::vector<std::shared_ptr<framework::OpDesc>> ops = block->Ops();
+    ops_of_block_.resize(ops.size());
+    for (int i = 0; i < ops.size(); ++i) {
+      std::shared_ptr<framework::OpDesc> op_desc = ops[i];
+      auto op_handler = framework::OpRegistry<CPU>::CreateOp(
+          op_desc->Type(), op_desc->GetInputs(), op_desc->GetOutputs(),
+          op_desc->GetAttrMap(), scope_);
+      ops_of_block_[i] = op_handler;
+    }
+  }
+
+  void Run() {
+    for (auto &op_handler : ops_of_block_) {
+      DLOG << "run op: " << op_handler->Type();
+      op_handler->InferShape();
+      op_handler->Run();
+      DLOG << "run op finish";
+    }
+  }
+
+ private:
+  std::shared_ptr<framework::Scope> scope_;
+  std::vector<OperatorPtr> ops_of_block_;
+};
+
 template <>
 bool WhileKernel<CPU, float>::Init(WhileParam<CPU> *param) {
   return true;
@@ -26,8 +60,15 @@ bool WhileKernel<CPU, float>::Init(WhileParam<CPU> *param) {
 template <>
 void WhileKernel<CPU, float>::Compute(const WhileParam<CPU> &param) {
   // TODO(hjchen2)
+  auto &current_scope = param.scope_->NewScope();
+  StepExecutor executor(param.sub_block_, &current_scope);
+  while (param.cond_->data<bool>()[0]) {
+    executor.Run();
+  }
+  param.scope_->DeleteScope(&current_scope);
 }
-#endif  // WHILE_OP
 
 }  // namespace operators
 }  // namespace paddle_mobile
+
+#endif  // WHILE_OP
diff --git a/src/operators/kernel/beam_search_decode_kernel.h b/src/operators/kernel/beam_search_decode_kernel.h
new file mode 100644
index 0000000000000000000000000000000000000000..fa40436115c5e03bfbfb6d2e9915ec6649d6f4b1
--- /dev/null
+++ b/src/operators/kernel/beam_search_decode_kernel.h
@@ -0,0 +1,57 @@
+/* Copyright (c) 2018 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. */
+
+#ifdef BEAM_SEARCH_DECODE_OP
+
+#pragma once
+
+#include "framework/operator.h"
+#include "operators/op_param.h"
+
+namespace paddle_mobile {
+namespace operators {
+
+template <typename Dtype>
+class BeamSearchDecodeParam : public OpParam {
+ public:
+  BeamSearchDecodeParam(const VariableNameMap &inputs,
+                        const VariableNameMap &outputs,
+                        const AttributeMap &attrs, const Scope &scope) {
+    ids_ =
+        OpParam::GetVarValue<framework::LoDTensorArray>("Ids", inputs, scope);
+    scores_ = OpParam::GetVarValue<framework::LoDTensorArray>("Scores", inputs,
+                                                              scope);
+    sentence_ids_ = OpParam::GetVarValue<framework::LoDTensor>("SentenceIds",
+                                                               outputs, scope);
+    sentence_scores_ = OpParam::GetVarValue<framework::LoDTensor>(
+        "SentenceScores", outputs, scope);
+    beam_size_ = OpParam::GetAttr<int>("beam_size", attrs);
+    end_id_ = OpParam::GetAttr<int>("end_id", attrs);
+  }
+
+ public:
+  framework::LoDTensorArray *ids_;
+  framework::LoDTensorArray *scores_;
+  framework::LoDTensor *sentence_ids_;
+  framework::LoDTensor *sentence_scores_;
+  int beam_size_;
+  int end_id_;
+};
+
+DECLARE_KERNEL(BeamSearchDecode, BeamSearchDecodeParam);
+
+}  // namespace operators
+}  // namespace paddle_mobile
+
+#endif  // BEAM_SEARCH_DECODE_OP
diff --git a/src/operators/kernel/while_kernel.h b/src/operators/kernel/while_kernel.h
index 4b9d0ffe58f4c552b4d05f494432296a6fc87fd4..64fb7a607e7f9d8fdbd2c6d1091b9da7133831be 100644
--- a/src/operators/kernel/while_kernel.h
+++ b/src/operators/kernel/while_kernel.h
@@ -26,18 +26,16 @@ class WhileParam : public OpParam {
  public:
   WhileParam(const VariableNameMap &inputs, const VariableNameMap &outputs,
              const AttributeMap &attrs, const Scope &scope)
-      : inputs_(inputs), outputs_(outputs), scope_(scope) {
+      : scope_(&scope) {
     cond_ =
         OpParam::GetVarValue<framework::LoDTensor>("Condition", inputs, scope);
     sub_block_ = OpParam::GetAttr<framework::BlockDesc *>("sub_block", attrs);
   }
 
  public:
+  const Scope *scope_;
   framework::LoDTensor *cond_;
-  const framework::BlockDesc *sub_block_;
-  const VariableNameMap inputs_;
-  const VariableNameMap outputs_;
-  const Scope scope_;
+  framework::BlockDesc *sub_block_;
 };
 
 DECLARE_KERNEL(While, WhileParam);
diff --git a/src/operators/op_param.h b/src/operators/op_param.h
index 00fbfbc771cfe9329b8ba76f120a5bc304dc80fc..267ed2effba14116a2d43914f33f9c921f1a456b 100644
--- a/src/operators/op_param.h
+++ b/src/operators/op_param.h
@@ -1172,18 +1172,21 @@ class FeedParam : public OpParam {
  public:
   FeedParam(const VariableNameMap &inputs, const VariableNameMap &outputs,
             const AttributeMap &attrs, const Scope &scope) {
-    input_x_ = InputXFrom<LoDTensor>(inputs, scope);
+    input_x_ = InputXFrom<framework::LoDTensorArray>(inputs, scope);
     out_ = OutFrom<GType>(outputs, scope);
+    col_ = GetAttr<int>("col", attrs);
     auto var = scope.FindVar("batch_size");
     batch_size = var->GetValue<int>();
   }
-  const LoDTensor *InputX() const { return input_x_; }
+  const framework::LoDTensorArray *InputX() const { return input_x_; }
   GType *Out() const { return out_; }
+  const int Col() const { return col_; }
   const int BatchSize() const { return batch_size; }
 
  private:
-  LoDTensor *input_x_;
+  framework::LoDTensorArray *input_x_;
   GType *out_;
+  int col_;
   int batch_size;
 };
 
@@ -3008,24 +3011,6 @@ class LogicalUnaryParam : public OpParam {
 };
 #endif  // LOGICAL_NOT_OP
 
-// #ifdef WHILE_OP
-// template <typename Dtype>
-// class WhileParam : public OpParam {
-//  public:
-//   WhileParam(const VariableNameMap &inputs,
-//              const VariableNameMap &outputs, const AttributeMap &attrs,
-//              const Scope &scope) {
-//     cond_ = OpParam::GetVarValue<framework::LoDTensor>("Condition", inputs,
-//     scope); block_desc_ = OpParam::GetAttr<framework::BlockDesc
-//     *>("sub_block", attrs);
-//   }
-//
-//  public:
-//   framework::LoDTensor *cond_;
-//   const framework::BlockDesc *block_desc_;
-// };
-// #endif  // WHILE_OP
-
 #ifdef WRITE_TO_ARRAY_OP
 template <typename Dtype>
 class WriteToArrayParam : public OpParam {
@@ -3099,17 +3084,17 @@ class IncrementParam : public OpParam {
                  const AttributeMap &attrs, const Scope &scope) {
     input_x_ = InputXFrom<GType>(inputs, scope);
     output_ = OutFrom<GType>(outputs, scope);
-    step_ = OpParam::GetAttr<int>("step", attrs);
+    step_ = OpParam::GetAttr<float>("step", attrs);
   }
 
   const GType *InputX() const { return input_x_; }
   GType *Out() const { return output_; }
-  int Step() const { return step_; }
+  float Step() const { return step_; }
 
  public:
   GType *input_x_;
   GType *output_;
-  int step_;
+  float step_;
 };
 #endif  // INCREMENT_OP
 
diff --git a/tools/op.cmake b/tools/op.cmake
index 89c23e47ca4ad98cd6b10d48e489f41c8319fb60..d25fce7cff14effbc1264dc46cba6364cee486bf 100644
--- a/tools/op.cmake
+++ b/tools/op.cmake
@@ -294,6 +294,7 @@ if(NOT FOUND_MATCH)
   set(PROPOSAL_OP ON)
   set(PSROI_POOL_OP ON)
   set(ROI_PERSPECTIVE_OP ON)
+  set(BEAM_SEARCH_DECODE_OP ON)
 endif()
 
   # option(BATCHNORM_OP "" ON)
@@ -597,3 +598,6 @@ endif()
 if (ROI_PERSPECTIVE_OP)
   add_definitions(-DROI_PERSPECTIVE_OP)
 endif()
+if (BEAM_SEARCH_DECODE_OP)
+  add_definitions(-DBEAM_SEARCH_DECODE_OP)
+endif()