diff --git a/parser/onnx/CMakeLists.txt b/parser/onnx/CMakeLists.txt
index 90eaf4e..2c222e1 100644
--- a/parser/onnx/CMakeLists.txt
+++ b/parser/onnx/CMakeLists.txt
@@ -4,7 +4,6 @@ set(SRC_LIST
     "onnx_data_parser.cc"
     "onnx_util.cc"
     "onnx_constant_parser.cc"
-    "onnx_file_constant_parser.cc"
     "subgraph_adapter/if_subgraph_adapter.cc"
     "subgraph_adapter/subgraph_adapter_factory.cc"
 )
diff --git a/parser/onnx/module.mk b/parser/onnx/module.mk
index 1edd19b..e537d61 100644
--- a/parser/onnx/module.mk
+++ b/parser/onnx/module.mk
@@ -17,7 +17,6 @@ PARSER_ONNX_SRC_FILES := \
     onnx_data_parser.cc \
     onnx_util.cc \
     onnx_constant_parser.cc \
-    onnx_file_constant_parser.cc \
     proto/onnx/ge_onnx.proto \
     proto/om.proto \
 
diff --git a/parser/onnx/onnx_constant_parser.cc b/parser/onnx/onnx_constant_parser.cc
index 06c6041..c4474cf 100644
--- a/parser/onnx/onnx_constant_parser.cc
+++ b/parser/onnx/onnx_constant_parser.cc
@@ -34,7 +34,11 @@ using namespace ge::parser;
 
 namespace ge {
 namespace {
-  const char *kConstant = "Const";
+const char *kConstant = "Const";
+const char *const kLocation = "location";
+const char *const kOffset = "offset";
+const char *const kLength = "length";
+const int64_t kOffsetCoefficient = 4096;
 }
 Status OnnxConstantParser::ParseConvertData(const ge::onnx::TensorProto &tensor_proto, ge::Tensor &tensor, int count) {
   int64_t data_type = tensor_proto.data_type();
@@ -153,6 +157,79 @@ void OnnxConstantParser::ParseConvertDataElements(const ge::onnx::TensorProto &t
   }
 }
 
+Status OnnxConstantParser::LoadWeightFromFile(ge::Tensor &tensor, std::string &file_path, size_t offset,
+                                              size_t length) {
+  const GeTensor ge_tensor = TensorAdapter::AsGeTensor(tensor);
+  const auto &tensor_desc = ge_tensor.GetTensorDesc();
+  int64_t weight_size = 0;
+  GE_CHK_STATUS_RET(TensorUtils::GetTensorSizeInBytes(tensor_desc, weight_size),
+                    "Failed to get file constant weight size.");
+  const size_t file_length = (length == 0U ? static_cast<size_t>(weight_size) : length);
+  const std::string real_path = ge::parser::RealPath(file_path.c_str());
+  GE_CHECK_NOTNULL(real_path.c_str());
+  std::ifstream ifs(real_path, std::ifstream::binary);
+  if (!ifs.is_open()) {
+    REPORT_INNER_ERROR("E19999", "Read file %s failed.", file_path.c_str());
+    GELOGE(FAILED, "[Read][File]Failed, file %s.", file_path.c_str());
+    return FAILED;
+  }
+  ifs.clear();
+  ifs.seekg(offset, ifs.beg);
+  const std::unique_ptr<char_t[]> bin_buff = std::unique_ptr<char_t[]>(new (std::nothrow) char_t[file_length]);
+  (void)ifs.read(static_cast<char_t *>(bin_buff.get()), static_cast<int64_t>(file_length));
+  ifs.close();
+  tensor.SetData(reinterpret_cast<uint8_t *>(bin_buff.get()), file_length);
+  GELOGD("Load weight from %s success.", file_path.c_str());
+  return SUCCESS;
+}
+
+Status OnnxConstantParser::ParseExternalWeight(const ge::onnx::TensorProto &tensor_proto, ge::Tensor &tensor) {
+  std::string file_path;
+  int64_t attr_offset = 0;
+  int64_t attr_length = 0;
+  for (int32_t i = 0; i < tensor_proto.external_data_size(); ++i) {
+    const ge::onnx::StringStringEntryProto &string_proto = tensor_proto.external_data(i);
+    if (string_proto.key() == kLocation) {
+      file_path = string_proto.value();
+      continue;
+    }
+    if (string_proto.key() == kOffset) {
+      try {
+        attr_offset = stol(string_proto.value());
+      } catch (const std::exception &e) {
+        REPORT_INNER_ERROR("E19999", "Convert %s to int64_t value failed:%s", string_proto.value().c_str(), e.what());
+        GELOGE(domi::PARAM_INVALID, "Convert %s to int64_t value failed:%s", string_proto.value().c_str(), e.what());
+        return FAILED;
+      }
+      if (attr_offset > (std::numeric_limits<int64_t>::max() / kOffsetCoefficient)) {
+        REPORT_INNER_ERROR("E19999", "overflow, kOffsetCoefficient[%ld], value[%ld]", kOffsetCoefficient, attr_offset);
+        GELOGE(domi::PARAM_INVALID, "overflow, kOffsetCoefficient[%ld], value[%ld]", kOffsetCoefficient, attr_offset);
+        return FAILED;
+      }
+      attr_offset *= kOffsetCoefficient;
+      continue;
+    }
+    if (string_proto.key() == kLength) {
+      try {
+        attr_length = stol(string_proto.value());
+      } catch (const std::exception &e) {
+        REPORT_INNER_ERROR("E19999", "Convert %s to int64_t value failed:%s", string_proto.value().c_str(), e.what());
+        GELOGE(domi::PARAM_INVALID, "Convert %s to int64_t value failed:%s", string_proto.value().c_str(), e.what());
+        return FAILED;
+      }
+    }
+  }
+  if (file_path.empty()) {
+    REPORT_INNER_ERROR("E19999", "External tensor proto[%s] must contain location.", tensor_proto.name().c_str());
+    GELOGE(domi::PARAM_INVALID, "External tensor proto[%s] must contain location.", tensor_proto.name().c_str());
+    return FAILED;
+  }
+  GE_CHK_STATUS_RET(LoadWeightFromFile(tensor, file_path, static_cast<size_t>(attr_offset),
+                                       static_cast<size_t>(attr_length)),
+                    "Failed to load weight from file:%s", file_path.c_str());
+  return SUCCESS;
+}
+
 Status OnnxConstantParser::ParseConvertTensor(const ge::onnx::TensorProto &tensor_proto, ge::Tensor &tensor) {
   // convert shape and format
   std::vector<int64_t> tmp_shape;
@@ -173,9 +250,12 @@ Status OnnxConstantParser::ParseConvertTensor(const ge::onnx::TensorProto &tenso
   tensor.SetTensorDesc(tensor_desc);
 
   // set data
-  if (ParseConvertData(tensor_proto, tensor, count) != SUCCESS) {
-    GELOGE(FAILED, "[Invoke][ParseConvertData]Convert ge tensor data and format failed.");
-    return FAILED;
+  if (tensor_proto.data_location() == ge::onnx::TensorProto_DataLocation_EXTERNAL) {
+    GE_CHK_STATUS_RET(ParseExternalWeight(tensor_proto, tensor),
+                      "[Invoke][ParseExternalWeight]Load external weight file failed.");
+  } else {
+    GE_CHK_STATUS_RET(ParseConvertData(tensor_proto, tensor, count),
+                      "[Invoke][ParseConvertData]Convert ge tensor data and format failed.");
   }
   return SUCCESS;
 }
diff --git a/parser/onnx/onnx_constant_parser.h b/parser/onnx/onnx_constant_parser.h
index 1345783..1bdf047 100644
--- a/parser/onnx/onnx_constant_parser.h
+++ b/parser/onnx/onnx_constant_parser.h
@@ -32,6 +32,8 @@ class PARSER_FUNC_VISIBILITY OnnxConstantParser : public OnnxOpParser {
   static Status ParseConstFromInput(const ge::onnx::NodeProto *op_src, ge::Operator &op_def);
   static Status ParseConvertTensor(const ge::onnx::TensorProto &tensor_proto, ge::Tensor &tensor);
   static Status ParseConvertData(const ge::onnx::TensorProto &tensor_proto, ge::Tensor &tensor, int count);
+  static Status LoadWeightFromFile(ge::Tensor &tensor, std::string &file_path, size_t offset, size_t file_length);
+  static Status ParseExternalWeight(const ge::onnx::TensorProto &tensor_proto, ge::Tensor &tensor);
   static void ParseConvertDataElements(const ge::onnx::TensorProto &tensor_proto, ge::Tensor &tensor, int count,
                                int64_t data_type);
   static Status ParseConvertDataType(const ge::onnx::TensorProto &tensor_proto, ge::Tensor &tensor);
diff --git a/parser/onnx/onnx_file_constant_parser.cc b/parser/onnx/onnx_file_constant_parser.cc
deleted file mode 100644
index 0271d11..0000000
--- a/parser/onnx/onnx_file_constant_parser.cc
+++ /dev/null
@@ -1,151 +0,0 @@
-/**
- * Copyright (c) Huawei Technologies Co., Ltd. 2020. 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 "onnx_file_constant_parser.h"
-#include <vector>
-
-#include "graph/ge_tensor.h"
-#include "parser/common/op_parser_factory.h"
-#include "parser/onnx/onnx_util.h"
-#include "framework/common/util.h"
-#include "framework/common/types.h"
-
-using ge::onnx::NodeProto;
-using ge::onnx::TensorProto;
-using domi::ONNX;
-using GeShape = ge::GeShape;
-using GeTensorDesc = ge::GeTensorDesc;
-using namespace ge::parser;
-
-namespace {
-const char *const kAttrShape = "shape";
-const char *const kAttrDataType = "dtype";
-const char *const kFileConstantPath = "file_constant_path";
-const char *const kLocation = "location";
-const char *const kOffset = "offset";
-const int64_t kOffsetCoefficient = 4096;
-const char *const kFileConstant = "FileConstant";
-}
-namespace ge {
-Status OnnxFileConstantParser::ParseParams(const Message *op_src, ge::Operator &op_def) {
-  GE_CHECK_NOTNULL(op_src);
-  const ge::onnx::NodeProto *node = PtrToPtr<const Message, const ge::onnx::NodeProto>(op_src);
-  GELOGD("Onnx op node name = %s, op type= %s, parse params", node->name().c_str(), node->op_type().c_str());
-
-  ge::onnx::TensorProto tensor_proto;
-  if (GetTensorProto(*node, tensor_proto) != SUCCESS) {
-    REPORT_INNER_ERROR("E19999", "node[%s] get tensor failed", node->name().c_str());
-    GELOGE(domi::PARAM_INVALID, "[Get][TensorProto] node[%s] get tensor failed", node->name().c_str());
-    return FAILED;
-  }
-  if (ParseDataType(tensor_proto, op_def) != SUCCESS) {
-    REPORT_INNER_ERROR("E19999", "node[%s] parse data type failed", node->name().c_str());
-    GELOGE(domi::PARAM_INVALID, "[Parse][Shape] node[%s] parse data type failed", node->name().c_str());
-    return FAILED;
-  }
-  if (ParsePath(tensor_proto, op_def) != SUCCESS) {
-    REPORT_INNER_ERROR("E19999", "node[%s] parse file path failed", node->name().c_str());
-    GELOGE(domi::PARAM_INVALID, "[Parse][Shape] node[%s] parse file path failed", node->name().c_str());
-    return FAILED;
-  }
-  ParseShape(tensor_proto, op_def);
-  return SUCCESS;
-}
-
-Status OnnxFileConstantParser::GetTensorProto(const ge::onnx::NodeProto &node_proto,
-                                              ge::onnx::TensorProto &tensor_proto) const {
-  for (const auto &it : node_proto.attribute()) {
-    if (it.name() != ge::kAttrNameValue) {
-      continue;
-    }
-    tensor_proto = it.t();
-    return SUCCESS;
-  }
-  REPORT_INNER_ERROR("E19999", "node_proto[%s] get value failed", node_proto.name().c_str());
-  GELOGE(ge::PARAM_INVALID, "[Get][TensorProto] node_proto[%s] get value failed", node_proto.name().c_str());
-  return FAILED;
-}
-
-void OnnxFileConstantParser::ParseShape(const ge::onnx::TensorProto &tensor_proto, ge::Operator &op_def) const {
-  std::vector<int64_t> tmp_shape;
-  for (int i = 0; i < tensor_proto.dims_size(); i++) {
-    tmp_shape.push_back(tensor_proto.dims(i));
-  }
-  op_def.SetAttr(kAttrShape, tmp_shape);
-}
-
-Status OnnxFileConstantParser::ParseDataType(const ge::onnx::TensorProto &tensor_proto, ge::Operator &op_def) const {
-  int64_t data_type = tensor_proto.data_type();
-  ge::DataType type = ge::OnnxUtil::ConvertOnnxDataType(data_type);
-  if (type >= ge::DataType::DT_UNDEFINED) {
-    REPORT_INNER_ERROR("E19999", "tensor_proto date type %ld is undefined.", data_type);
-    GELOGE(domi::PARAM_INVALID, "[Check][Param] tensor_proto date type %ld is undefined.", data_type);
-    return FAILED;
-  }
-
-  op_def.SetAttr(kAttrDataType, type);
-  return SUCCESS;
-}
-
-Status OnnxFileConstantParser::ParsePath(const ge::onnx::TensorProto &tensor_proto, ge::Operator &op_def) const {
-  ge::NamedAttrs attrs;
-  for (int32_t i = 0; i < tensor_proto.external_data_size(); ++i) {
-    const ge::onnx::StringStringEntryProto &string_proto = tensor_proto.external_data(i);
-    if (SetPathAttr(string_proto, attrs) != SUCCESS) {
-      REPORT_INNER_ERROR("E19999", "external tensor proto[%s] parse attrs failed.", tensor_proto.name().c_str());
-      GELOGE(domi::PARAM_INVALID, "external tensor proto[%s] parse attrs failed.", tensor_proto.name().c_str());
-      return FAILED;
-    }
-  }
-
-  if (!attrs.HasAttr(kLocation)) {
-    REPORT_INNER_ERROR("E19999", "external tensor proto[%s] must contain location.", tensor_proto.name().c_str());
-    GELOGE(domi::PARAM_INVALID, "external tensor proto[%s] must contain location.", tensor_proto.name().c_str());
-    return FAILED;
-  }
-  op_def.SetAttr(kFileConstantPath, attrs);
-  GELOGD("The weight file of Op[%s] is: [%s].", tensor_proto.name().c_str(), attrs.GetName().c_str());
-  return SUCCESS;
-}
-
-Status OnnxFileConstantParser::SetPathAttr(const ge::onnx::StringStringEntryProto &string_proto,
-                                           ge::NamedAttrs &attrs) const {
-  if (string_proto.key() == kLocation) {
-    AttrUtils::SetStr(attrs, kLocation, string_proto.value());
-  } else {
-    int64_t value;
-    try {
-      value = stol(string_proto.value());
-    } catch (const std::exception &e) {
-      REPORT_INNER_ERROR("E19999", "Convert %s to int64_t value failed:%s", string_proto.value().c_str(), e.what());
-      GELOGE(domi::PARAM_INVALID, "Convert %s to int64_t value failed:%s", string_proto.value().c_str(), e.what());
-      return FAILED;
-    }
-    if (string_proto.key() == kOffset) {
-      if (value > (std::numeric_limits<int64_t>::max() / kOffsetCoefficient)) {
-        REPORT_INNER_ERROR("E19999", "overflow, kOffsetCoefficient[%ld], value[%ld]", kOffsetCoefficient, value);
-        GELOGE(domi::PARAM_INVALID, "overflow, kOffsetCoefficient[%ld], value[%ld]", kOffsetCoefficient, value);
-        return FAILED;
-      }
-      value *= kOffsetCoefficient;
-    }
-    AttrUtils::SetInt(attrs, string_proto.key(), value);
-  }
-  return SUCCESS;
-}
-
-REGISTER_OP_PARSER_CREATOR(ONNX, kFileConstant, OnnxFileConstantParser);
-}  // namespace ge
\ No newline at end of file
diff --git a/parser/onnx/onnx_file_constant_parser.h b/parser/onnx/onnx_file_constant_parser.h
deleted file mode 100644
index a0ff9b4..0000000
--- a/parser/onnx/onnx_file_constant_parser.h
+++ /dev/null
@@ -1,37 +0,0 @@
-/**
- * Copyright (c) Huawei Technologies Co., Ltd. 2020. 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.
- */
-
-#ifndef GE_PARSER_ONNX_ONNX_FILE_CONSTANT_PARSER_H_
-#define GE_PARSER_ONNX_ONNX_FILE_CONSTANT_PARSER_H_
-
-#include "parser/onnx/onnx_op_parser.h"
-#include "proto/onnx/ge_onnx.pb.h"
-
-namespace ge {
-class PARSER_FUNC_VISIBILITY OnnxFileConstantParser : public OnnxOpParser {
- public:
-  Status ParseParams(const Message *op_src, ge::Operator &op_def) override;
-
- private:
-  Status ParsePath(const ge::onnx::TensorProto &tensor_proto, ge::Operator &op_def) const;
-  Status ParseDataType(const ge::onnx::TensorProto &tensor_proto, ge::Operator &op_def) const;
-  void ParseShape(const ge::onnx::TensorProto &tensor_proto, ge::Operator &op_def) const;
-  Status GetTensorProto(const ge::onnx::NodeProto &node_proto, ge::onnx::TensorProto &tensor_proto) const;
-  Status SetPathAttr(const ge::onnx::StringStringEntryProto &string_proto, ge::NamedAttrs &attrs) const;
-};
-}  // namespace ge
-
-#endif  // GE_PARSER_ONNX_ONNX_FILE_CONSTANT_PARSER_H_
diff --git a/parser/onnx/onnx_parser.cc b/parser/onnx/onnx_parser.cc
index 6ceaa51..188b491 100644
--- a/parser/onnx/onnx_parser.cc
+++ b/parser/onnx/onnx_parser.cc
@@ -166,8 +166,7 @@ namespace ge {
 namespace {
 const std::map<std::string, std::string> kOnnxOpMap = {
     {ge::kOpTypeInput, ge::parser::DATA},
-    {ge::kOpTypeConstant, ge::parser::CONSTANT},
-    {ge::kFileConstant, ge::parser::FILECONSTANT}
+    {ge::kOpTypeConstant, ge::parser::CONSTANT}
 };
 const int64_t kDimValue = 1;
 
@@ -183,7 +182,7 @@ Status GenSubgraphParseTasks(const ge::ComputeGraphPtr &parent_graph, std::deque
   for (auto &node : parent_graph->GetDirectNode()) {
     auto op_desc = node->GetOpDesc();
     GE_CHECK_NOTNULL(op_desc);
-    for (const auto subgraph_name_to_index : op_desc->GetSubgraphNameIndexes()) {
+    for (const auto &subgraph_name_to_index : op_desc->GetSubgraphNameIndexes()) {
       auto i = subgraph_name_to_index.second;
       auto subgraph_iname = subgraph_name_to_index.first;
       if (subgraph_iname.empty()) {
@@ -359,37 +358,18 @@ Status OnnxModelParser::ParseInitializer(ge::onnx::GraphProto &onnx_graph,
     ge::onnx::NodeProto *const_node = onnx_graph.add_node();
     std::string output_name = it.first + "_" + to_string(index++);
     const_node->set_name(output_name);
+    const_node->set_op_type(ge::kOpTypeConstant);
     const_node->add_output(it.first);
     ge::onnx::AttributeProto *attribute = const_node->add_attribute();
     attribute->set_name(ge::kAttrNameValue);
     ge::onnx::TensorProto *attribute_t = attribute->mutable_t();
     *attribute_t = it.second;
-    if (it.second.data_location() == ge::onnx::TensorProto_DataLocation_EXTERNAL) {
-      const_node->set_op_type(kFileConstant);
-      GELOGD("Initializer const node [%s], the weight was stored in the file.", const_node->name().c_str());
-    } else {
-      const_node->set_op_type(ge::kOpTypeConstant);
-    }
   }
 
   return SUCCESS;
 }
 
-void OnnxModelParser::UpdateConstantOpType(ge::onnx::NodeProto *node) const {
-  // If weight in file, Marker Constant(not Initializer) as file constant
-  for (auto it : node->attribute()) {
-    if (it.name() == ge::kAttrNameValue) {
-      const ::ge::onnx::TensorProto tensor_proto = it.t();
-      if (tensor_proto.data_location() == ge::onnx::TensorProto_DataLocation_EXTERNAL) {
-        node->set_op_type(kFileConstant);
-        GELOGD("Const node [%s], the weight was stored in the file.", node->name().c_str());
-      }
-      break;
-    }
-  }
-}
-
-void OnnxModelParser::UpdateNodeNameAndOpType(ge::onnx::GraphProto &onnx_graph) const {
+void OnnxModelParser::UpdateAllNodeName(ge::onnx::GraphProto &onnx_graph) const {
   int index = 0;
   for (int i = 0; i < onnx_graph.node_size(); i++) {
     ge::onnx::NodeProto *node = onnx_graph.mutable_node(i);
@@ -397,9 +377,6 @@ void OnnxModelParser::UpdateNodeNameAndOpType(ge::onnx::GraphProto &onnx_graph)
       std::string node_name = node->op_type() + "_" + to_string(index++);
       node->set_name(node_name);
     }
-    if (node->op_type() == kOpTypeConstant) {
-      UpdateConstantOpType(node);
-    }
   }
 }
 
@@ -984,7 +961,7 @@ Status OnnxModelParser::ModelParseToGraphImpl(bool is_subgraph, ge::onnx::GraphP
   }
   GELOGI("The size of initializer_name_tensor is %zu after ParseInput", initializer_name_tensor.size());
 
-  // 3. Parse Constant(initializer) from graph.
+  // 3. Parse Constant from graph.
   ret = ParseInitializer(onnx_graph, initializer_name_tensor);
   if (ret != SUCCESS) {
     GELOGE(ret, "[Parse][Initializer] for onnx failed.");
@@ -998,8 +975,8 @@ Status OnnxModelParser::ModelParseToGraphImpl(bool is_subgraph, ge::onnx::GraphP
     return ret;
   }
 
-  // 5. Update node name for node do not has name, update const op type
-  UpdateNodeNameAndOpType(onnx_graph);
+  // 5. Update node name for node do not has name.
+  UpdateAllNodeName(onnx_graph);
 
   // 6 Precheck.
   ret = Prechecker(onnx_graph);
diff --git a/parser/onnx/onnx_parser.h b/parser/onnx/onnx_parser.h
index 394ff23..90b7397 100644
--- a/parser/onnx/onnx_parser.h
+++ b/parser/onnx/onnx_parser.h
@@ -105,9 +105,7 @@ class PARSER_FUNC_VISIBILITY OnnxModelParser : public domi::ModelParser {
   Status ParseInitializer(ge::onnx::GraphProto &onnx_graph,
                           std::map<std::string, ge::onnx::TensorProto> &initializer_name_tensor) const;
 
-  void UpdateConstantOpType(ge::onnx::NodeProto *node) const;
-
-  void UpdateNodeNameAndOpType(ge::onnx::GraphProto &onnx_graph) const;
+  void UpdateAllNodeName(ge::onnx::GraphProto &onnx_graph) const;
 
   Status ConstructOriType(const ge::onnx::NodeProto *node_proto, std::string &ori_type);
 
diff --git a/parser/onnx/onnx_util.h b/parser/onnx/onnx_util.h
index 7cecd26..ed9f9f3 100644
--- a/parser/onnx/onnx_util.h
+++ b/parser/onnx/onnx_util.h
@@ -50,7 +50,6 @@ const char *const kAttrNameIndex = "index";
 const char *const kAttrNameIsSubgraphOp = "is_subgraph_op";
 const char *const kOpTypeConstant = "Constant";
 const char *const kOpTypeInput = "Input";
-const char *const kFileConstant = "FileConstant";
 
 class OnnxUtil {
  public:
diff --git a/tests/depends/mmpa/src/mmpa_stub.cc b/tests/depends/mmpa/src/mmpa_stub.cc
index 070964d..5f0895c 100644
--- a/tests/depends/mmpa/src/mmpa_stub.cc
+++ b/tests/depends/mmpa/src/mmpa_stub.cc
@@ -148,7 +148,66 @@ void *memCpyS(void *dest, const void *src, UINT32 count) {
   return dest;
 }
 
-INT32 mmRmdir(const CHAR *lp_path_name) { return rmdir(lp_path_name); }
+INT32 mmRmdir(const CHAR *lp_path_name) {
+  INT32 ret;
+  DIR *childDir = NULL;
+
+  if (lp_path_name == NULL) {
+    return EN_INVALID_PARAM;
+  }
+  DIR *dir = opendir(lp_path_name);
+  if (dir == NULL) {
+    return EN_INVALID_PARAM;
+  }
+
+  const struct dirent *entry = NULL;
+  size_t bufSize = strlen(lp_path_name) + (size_t)(PATH_SIZE + 2); // make sure the length is large enough
+  while ((entry = readdir(dir)) != NULL) {
+    if ((strcmp(".", entry->d_name) == MMPA_ZERO) || (strcmp("..", entry->d_name) == MMPA_ZERO)) {
+      continue;
+    }
+    CHAR *buf = (CHAR *)malloc(bufSize);
+    if (buf == NULL) {
+      break;
+    }
+    ret = memset_s(buf, bufSize, 0, bufSize);
+    if (ret == EN_ERROR) {
+      free(buf);
+      buf = NULL;
+      break;
+    }
+    ret = snprintf_s(buf, bufSize, bufSize - 1U, "%s/%s", lp_path_name, entry->d_name);
+    if (ret == EN_ERROR) {
+      free(buf);
+      buf = NULL;
+      break;
+    }
+
+    childDir = opendir(buf);
+    if (childDir != NULL) {
+      (VOID)closedir(childDir);
+      (VOID)mmRmdir(buf);
+      free(buf);
+      buf = NULL;
+      continue;
+    } else {
+      ret = unlink(buf);
+      if (ret == EN_OK) {
+        free(buf);
+        continue;
+      }
+    }
+    free(buf);
+    buf = NULL;
+  }
+  (VOID)closedir(dir);
+
+  ret = rmdir(lp_path_name);
+  if (ret == EN_ERROR) {
+    return EN_ERROR;
+  }
+  return EN_OK;
+}
 
 mmTimespec mmGetTickCount() {
   mmTimespec rts;
@@ -229,7 +288,14 @@ VOID mmScandirFree(mmDirent **entryList, INT32 count)
 
 INT32 mmAccess2(const CHAR *pathName, INT32 mode)
 {
-  return 0;
+  if (pathName == NULL) {
+    return EN_INVALID_PARAM;
+  }
+  INT32 ret = access(pathName, mode);
+  if (ret != EN_OK) {
+    return EN_ERROR;
+  }
+  return EN_OK;
 }
 
 INT32 mmGetTimeOfDay(mmTimeval *timeVal, mmTimezone *timeZone)
@@ -239,7 +305,15 @@ INT32 mmGetTimeOfDay(mmTimeval *timeVal, mmTimezone *timeZone)
 
 INT32 mmRealPath(const CHAR *path, CHAR *realPath, INT32 realPathLen)
 {
-  return 0;
+  INT32 ret = EN_OK;
+  if ((path == NULL) || (realPath == NULL) || (realPathLen < MMPA_MAX_PATH)) {
+    return EN_INVALID_PARAM;
+  }
+  const CHAR *ptr = realpath(path, realPath);
+  if (ptr == NULL) {
+    ret = EN_ERROR;
+  }
+  return ret;
 }
 
 INT32 mmGetErrorCode()
diff --git a/tests/st/CMakeLists.txt b/tests/st/CMakeLists.txt
index ac4716e..2ec59cf 100644
--- a/tests/st/CMakeLists.txt
+++ b/tests/st/CMakeLists.txt
@@ -275,7 +275,6 @@ set(PARSER_SRC_FILES
     "${PARSER_DIR}/parser/common/thread_pool.cc"
     "${PARSER_DIR}/parser/common/auto_mapping_subgraph_io_index_func.cc"
     "${PARSER_DIR}/parser/onnx/onnx_constant_parser.cc"
-    "${PARSER_DIR}/parser/onnx/onnx_file_constant_parser.cc"
     "${PARSER_DIR}/parser/onnx/onnx_custom_parser_adapter.cc"
     "${PARSER_DIR}/parser/onnx/onnx_data_parser.cc"
     "${PARSER_DIR}/parser/onnx/onnx_parser.cc"
diff --git a/tests/st/testcase/origin_models/file_constant_weight.bin b/tests/st/testcase/origin_models/file_constant_weight.bin
new file mode 100644
index 0000000..8352675
Binary files /dev/null and b/tests/st/testcase/origin_models/file_constant_weight.bin differ
diff --git a/tests/st/testcase/test_onnx_parser.cc b/tests/st/testcase/test_onnx_parser.cc
index 69a335c..e01badc 100644
--- a/tests/st/testcase/test_onnx_parser.cc
+++ b/tests/st/testcase/test_onnx_parser.cc
@@ -106,7 +106,52 @@ void STestOnnxParser::RegisterCustomOp() {
   domi::OpRegistry::Instance()->registrationDatas.clear();
 }
 
-ge::onnx::GraphProto CreateOnnxGraph() {
+ge::onnx::GraphProto CreateOnnxGraph1() {
+  std::string case_dir = __FILE__;
+  case_dir = case_dir.substr(0, case_dir.find_last_of("/"));
+  std::string external_weight_file = case_dir + "/origin_models/file_constant_weight.bin";
+
+  ge::onnx::GraphProto onnx_graph;
+  (void)onnx_graph.add_input();
+  (void)onnx_graph.add_output();
+  ::ge::onnx::NodeProto* node_const1 = onnx_graph.add_node();
+  ::ge::onnx::NodeProto* node_const2 = onnx_graph.add_node();
+  ::ge::onnx::NodeProto* node_add = onnx_graph.add_node();
+  node_const1->set_op_type(kOpTypeConstant);
+  node_const2->set_op_type(kOpTypeConstant);
+  node_add->set_op_type("Add");
+  node_add->set_domain("ai.onnx");
+
+  ::ge::onnx::AttributeProto* attr = node_const1->add_attribute();
+  attr->set_name(ge::kAttrNameValue);
+  ::ge::onnx::TensorProto* tensor_proto = attr->mutable_t();
+  tensor_proto->set_data_type(OnnxDataType::UINT8);
+  tensor_proto->set_data_location(ge::onnx::TensorProto_DataLocation_EXTERNAL);
+  ge::onnx::StringStringEntryProto *string_proto = tensor_proto->add_external_data();
+  string_proto->set_key("location");
+  string_proto->set_value(external_weight_file);
+  ge::onnx::StringStringEntryProto *offset_proto = tensor_proto->add_external_data();
+  offset_proto->set_key("offset");
+  offset_proto->set_value("0");
+  ge::onnx::StringStringEntryProto *length_proto = tensor_proto->add_external_data();
+  length_proto->set_key("length");
+  length_proto->set_value("3");
+  tensor_proto->add_dims(3);
+
+  attr = node_const2->add_attribute();
+  attr->set_name(ge::kAttrNameValue);
+  tensor_proto = attr->mutable_t();
+  tensor_proto->set_data_type(OnnxDataType::UINT8);
+  tensor_proto->set_data_location(ge::onnx::TensorProto_DataLocation_DEFAULT);
+  tensor_proto->add_dims(3);
+  size_t raw_data_size = 3;
+  std::unique_ptr<uint8_t[]> raw_data(new (std::nothrow) uint8_t[raw_data_size / sizeof(uint8_t)]);
+  tensor_proto->set_raw_data(reinterpret_cast<char *>(raw_data.get()), raw_data_size);
+
+  return onnx_graph;
+}
+
+ge::onnx::GraphProto CreateOnnxGraph2() {
   ge::onnx::GraphProto onnx_graph;
   (void)onnx_graph.add_input();
   (void)onnx_graph.add_output();
@@ -116,17 +161,66 @@ ge::onnx::GraphProto CreateOnnxGraph() {
   node_const1->set_op_type(kOpTypeConstant);
   node_const2->set_op_type(kOpTypeConstant);
   node_add->set_op_type("Add");
+  node_add->set_domain("ai.onnx");
 
   ::ge::onnx::AttributeProto* attr = node_const1->add_attribute();
   attr->set_name(ge::kAttrNameValue);
   ::ge::onnx::TensorProto* tensor_proto = attr->mutable_t();
+  tensor_proto->set_data_type(OnnxDataType::UINT8);
   tensor_proto->set_data_location(ge::onnx::TensorProto_DataLocation_EXTERNAL);
-  attr = node_const1->add_attribute();
+  tensor_proto->add_dims(3);
 
   attr = node_const2->add_attribute();
   attr->set_name(ge::kAttrNameValue);
   tensor_proto = attr->mutable_t();
+  tensor_proto->set_data_type(OnnxDataType::UINT8);
   tensor_proto->set_data_location(ge::onnx::TensorProto_DataLocation_DEFAULT);
+  tensor_proto->add_dims(3);
+  size_t raw_data_size = 3;
+  std::unique_ptr<uint8_t[]> raw_data(new (std::nothrow) uint8_t[raw_data_size / sizeof(uint8_t)]);
+  tensor_proto->set_raw_data(reinterpret_cast<char *>(raw_data.get()), raw_data_size);
+
+  return onnx_graph;
+}
+
+ge::onnx::GraphProto CreateOnnxGraph3() {
+  std::string case_dir = __FILE__;
+  case_dir = case_dir.substr(0, case_dir.find_last_of("/"));
+  std::string external_weight_file = case_dir + "/origin_models/file_constant_weight.bin";
+
+  ge::onnx::GraphProto onnx_graph;
+  (void)onnx_graph.add_input();
+  (void)onnx_graph.add_output();
+  ::ge::onnx::NodeProto* node_const1 = onnx_graph.add_node();
+  ::ge::onnx::NodeProto* node_const2 = onnx_graph.add_node();
+  ::ge::onnx::NodeProto* node_add = onnx_graph.add_node();
+  node_const1->set_op_type(kOpTypeConstant);
+  node_const2->set_op_type(kOpTypeConstant);
+  node_add->set_op_type("Add");
+  node_add->set_domain("ai.onnx");
+
+  ::ge::onnx::AttributeProto* attr = node_const1->add_attribute();
+  attr->set_name(ge::kAttrNameValue);
+  ::ge::onnx::TensorProto* tensor_proto = attr->mutable_t();
+  tensor_proto->set_data_type(OnnxDataType::UINT8);
+  tensor_proto->set_data_location(ge::onnx::TensorProto_DataLocation_EXTERNAL);
+  ge::onnx::StringStringEntryProto *string_proto = tensor_proto->add_external_data();
+  string_proto->set_key("location");
+  string_proto->set_value(external_weight_file);
+  ge::onnx::StringStringEntryProto *offset_proto = tensor_proto->add_external_data();
+  offset_proto->set_key("offset");
+  offset_proto->set_value("9999999999999999999999999999999999");
+  tensor_proto->add_dims(3);
+
+  attr = node_const2->add_attribute();
+  attr->set_name(ge::kAttrNameValue);
+  tensor_proto = attr->mutable_t();
+  tensor_proto->set_data_type(OnnxDataType::UINT8);
+  tensor_proto->set_data_location(ge::onnx::TensorProto_DataLocation_DEFAULT);
+  tensor_proto->add_dims(3);
+  size_t raw_data_size = 3;
+  std::unique_ptr<uint8_t[]> raw_data(new (std::nothrow) uint8_t[raw_data_size / sizeof(uint8_t)]);
+  tensor_proto->set_raw_data(reinterpret_cast<char *>(raw_data.get()), raw_data_size);
 
   return onnx_graph;
 }
@@ -212,15 +306,42 @@ TEST_F(STestOnnxParser, onnx_parser_if_node_with_const_input) {
   EXPECT_EQ(ret, GRAPH_SUCCESS);
 }
 
-TEST_F(STestOnnxParser, onnx_test_ModelParseToGraph)
+TEST_F(STestOnnxParser, onnx_test_ModelParseToGraph_1)
 {
-  OnnxModelParser modelParser;
+  OnnxModelParser model_parser;
+  model_parser.domain_verseion_["ai.onnx"] = 11;
   ge::onnx::ModelProto model_proto;
   auto onnx_graph = model_proto.mutable_graph();
-  *onnx_graph = CreateOnnxGraph();
-  ge::Graph graph;
+  *onnx_graph = CreateOnnxGraph1();
+  ge::Graph graph("graph");
+
+  Status ret = model_parser.ModelParseToGraph(model_proto, graph);
+  EXPECT_EQ(ret, FAILED);
+}
+
+TEST_F(STestOnnxParser, onnx_test_ModelParseToGraph_2)
+{
+  OnnxModelParser model_parser;
+  model_parser.domain_verseion_["ai.onnx"] = 11;
+  ge::onnx::ModelProto model_proto;
+  auto onnx_graph = model_proto.mutable_graph();
+  *onnx_graph = CreateOnnxGraph2();
+  ge::Graph graph("graph");
+
+  Status ret = model_parser.ModelParseToGraph(model_proto, graph);
+  EXPECT_EQ(ret, FAILED);
+}
+
+TEST_F(STestOnnxParser, onnx_test_ModelParseToGraph_3)
+{
+  OnnxModelParser model_parser;
+  model_parser.domain_verseion_["ai.onnx"] = 11;
+  ge::onnx::ModelProto model_proto;
+  auto onnx_graph = model_proto.mutable_graph();
+  *onnx_graph = CreateOnnxGraph3();
+  ge::Graph graph("graph");
 
-  Status ret = modelParser.ModelParseToGraph(model_proto, graph);
+  Status ret = model_parser.ModelParseToGraph(model_proto, graph);
   EXPECT_EQ(ret, FAILED);
 }
 } // namespace ge
diff --git a/tests/ut/parser/CMakeLists.txt b/tests/ut/parser/CMakeLists.txt
index 9694ed5..1ccb2ca 100644
--- a/tests/ut/parser/CMakeLists.txt
+++ b/tests/ut/parser/CMakeLists.txt
@@ -274,7 +274,6 @@ set(PARSER_SRC_FILES
     "${PARSER_DIR}/parser/common/thread_pool.cc"
     "${PARSER_DIR}/parser/common/auto_mapping_subgraph_io_index_func.cc"
     "${PARSER_DIR}/parser/onnx/onnx_constant_parser.cc"
-    "${PARSER_DIR}/parser/onnx/onnx_file_constant_parser.cc"
     "${PARSER_DIR}/parser/onnx/onnx_custom_parser_adapter.cc"
     "${PARSER_DIR}/parser/onnx/onnx_data_parser.cc"
     "${PARSER_DIR}/parser/onnx/onnx_parser.cc"
diff --git a/tests/ut/parser/testcase/onnx_parser_testcase/onnx_model/file_constant_weight.bin b/tests/ut/parser/testcase/onnx_parser_testcase/onnx_model/file_constant_weight.bin
new file mode 100644
index 0000000..8352675
Binary files /dev/null and b/tests/ut/parser/testcase/onnx_parser_testcase/onnx_model/file_constant_weight.bin differ
diff --git a/tests/ut/parser/testcase/onnx_parser_testcase/onnx_parser_unittest.cc b/tests/ut/parser/testcase/onnx_parser_testcase/onnx_parser_unittest.cc
index b944b55..f780bdb 100644
--- a/tests/ut/parser/testcase/onnx_parser_testcase/onnx_parser_unittest.cc
+++ b/tests/ut/parser/testcase/onnx_parser_testcase/onnx_parser_unittest.cc
@@ -17,10 +17,8 @@
 #include <gtest/gtest.h>
 #include <iostream>
 #include "parser/common/op_parser_factory.h"
-#include "graph/operator_reg.h"
 #include "external/graph/types.h"
 #include "register/op_registry.h"
-#include "parser/common/op_registration_tbe.h"
 #include "external/parser/onnx_parser.h"
 #include "ut/parser/parser_ut_utils.h"
 #include "external/ge/ge_api_types.h"
@@ -30,7 +28,6 @@
 #define protected public
 #define private public
 #include "parser/onnx/onnx_constant_parser.h"
-#include "parser/onnx/onnx_file_constant_parser.h"
 #include "parser/onnx/onnx_util.h"
 #include "parser/onnx/onnx_parser.h"
 #undef protected
@@ -399,188 +396,109 @@ TEST_F(UtestOnnxParser, OnnxConstantParser_ParseConvertDataType_test)
   EXPECT_EQ(ret, FAILED);
 }
 
-TEST_F(UtestOnnxParser, FileConstantGetTensorProto)
+TEST_F(UtestOnnxParser, OnnxConstantParser_ParseExternalWeight_test)
 {
-  OnnxFileConstantParser parser;
-  ge::onnx::NodeProto input_node;
-  ge::onnx::TensorProto tensor_proto;
-  Status ret = parser.GetTensorProto(input_node, tensor_proto);
-  EXPECT_EQ(ret, FAILED);
-
-  ge::onnx::AttributeProto *attribute = input_node.add_attribute();
-  attribute->set_name("attribute");
-  attribute = input_node.add_attribute();
-  attribute->set_name("value");
-
-  ge::onnx::TensorProto *attribute_tensor = attribute->mutable_t();
-  *attribute_tensor = tensor_proto;
-  ret = parser.GetTensorProto(input_node, tensor_proto);
-  EXPECT_EQ(ret, SUCCESS);
-}
-
-TEST_F(UtestOnnxParser, FileConstantParseShape)
-{
-  OnnxFileConstantParser parser;
-  ge::onnx::TensorProto tensor_proto;
-  tensor_proto.add_dims(4);
-  tensor_proto.add_dims(2);
-  ge::OpDescPtr op_desc_src = std::make_shared<ge::OpDesc>("file_constant", "FileConstant");
-  ge::Operator op = ge::OpDescUtils::CreateOperatorFromOpDesc(op_desc_src);
-
-  parser.ParseShape(tensor_proto, op);
-
-  std::vector<int64_t> attr_value;
-  op.GetAttr("shape", attr_value);
-  EXPECT_EQ(attr_value.size(), 2U);
-  if (attr_value.size() == 2U) {
-    EXPECT_EQ(attr_value[0], 4);
-    EXPECT_EQ(attr_value[1], 2);
-  }
-}
+  std::string case_dir = __FILE__;
+  case_dir = case_dir.substr(0, case_dir.find_last_of("/"));
+  std::string external_weight_file = case_dir + "/onnx_model/file_constant_weight.bin";
 
-TEST_F(UtestOnnxParser, FileConstantParseDataType)
-{
-  OnnxFileConstantParser parser;
+  OnnxConstantParser constant_parser;
   ge::onnx::TensorProto tensor_proto;
-  tensor_proto.set_data_type(OnnxDataType::UNDEFINED);
-  ge::OpDescPtr op_desc_src = std::make_shared<ge::OpDesc>("file_constant", "FileConstant");
-  ge::Operator op = ge::OpDescUtils::CreateOperatorFromOpDesc(op_desc_src);
 
-  Status ret = parser.ParseDataType(tensor_proto, op);
+  // without location, error
+  ge::Tensor tensor ;
+  TensorDesc tensor_desc = tensor.GetTensorDesc();
+  tensor_desc.SetDataType(ge::DataType::DT_UINT8);
+  tensor_desc.SetShape(ge::Shape({3}));
+  tensor.SetTensorDesc(tensor_desc);
+  auto ret = constant_parser.ParseExternalWeight(tensor_proto, tensor);
   EXPECT_EQ(ret, FAILED);
 
-  tensor_proto.set_data_type(OnnxDataType::UINT8);
-  ret = parser.ParseDataType(tensor_proto, op);
-  EXPECT_EQ(ret, SUCCESS);
-  ge::DataType attr_value;
-  op.GetAttr("dtype", attr_value);
-  EXPECT_EQ(attr_value, ge::DataType::DT_UINT8);
-}
-
-TEST_F(UtestOnnxParser, FileConstantParseAttr)
-{
-  OnnxFileConstantParser parser;
-  ge::onnx::StringStringEntryProto string_proto;
-  ge::NamedAttrs attrs;
-
-  // test location
-  string_proto.set_key("location");
-  string_proto.set_value("/usr/local");
-  Status ret = parser.SetPathAttr(string_proto, attrs);
-  EXPECT_EQ(ret, SUCCESS);
-  std::string attr_value;
-  AttrUtils::GetStr(attrs, "location", attr_value);
-  EXPECT_EQ(attr_value, "/usr/local");
-
-  // test offset
-  string_proto.set_key("offset");
-  string_proto.set_value("123");
-  ret = parser.SetPathAttr(string_proto, attrs);
+  // test location, success
+  ge::onnx::StringStringEntryProto *string_proto = tensor_proto.add_external_data();
+  string_proto->set_key("location");
+  string_proto->set_value(external_weight_file);
+  ret = constant_parser.ParseExternalWeight(tensor_proto, tensor);
   EXPECT_EQ(ret, SUCCESS);
-  int64_t offset_value;
-  AttrUtils::GetInt(attrs, "offset", offset_value);
-  EXPECT_EQ(offset_value, 123 * 4096);
-
-  // offset overflow
-  string_proto.set_key("offset");
-  string_proto.set_value("9223372036854775800");
-  ret = parser.SetPathAttr(string_proto, attrs);
-  EXPECT_EQ(ret, FAILED);
-
-  // itol exception
-  string_proto.set_key("offset");
-  string_proto.set_value("999999999999999999999999999999999999");
-  ret = parser.SetPathAttr(string_proto, attrs);
-  EXPECT_EQ(ret, FAILED);
-}
-
-TEST_F(UtestOnnxParser, FileConstantParsePath)
-{
-  OnnxFileConstantParser parser;
-  ge::onnx::TensorProto tensor_proto;
-  ge::OpDescPtr op_desc_src = std::make_shared<ge::OpDesc>("file_constant", "FileConstant");
-  ge::Operator op = ge::OpDescUtils::CreateOperatorFromOpDesc(op_desc_src);
 
-
-  // without location, error
-  auto ret = parser.ParsePath(tensor_proto, op);
-  EXPECT_EQ(ret, FAILED);
-
-  // SetPathAttr error
+  // test offset, overflow
   ge::onnx::StringStringEntryProto *offset_proto = tensor_proto.add_external_data();
   offset_proto->set_key("offset");
-  offset_proto->set_value("999999999999999999999999999999");
-  ret = parser.ParsePath(tensor_proto, op);
+  offset_proto->set_value("9999999999999999999999999999999999");
+  ret = constant_parser.ParseExternalWeight(tensor_proto, tensor);
   EXPECT_EQ(ret, FAILED);
 
-  // has location, success
-  ge::onnx::StringStringEntryProto *string_proto = tensor_proto.add_external_data();
-  string_proto->set_key("location");
-  string_proto->set_value("/usr/local");
+  // test tensor data
   offset_proto->set_key("offset");
   offset_proto->set_value("0");
-  ret = parser.ParsePath(tensor_proto, op);
+  ge::onnx::StringStringEntryProto *length_proto = tensor_proto.add_external_data();
+  length_proto->set_key("length");
+  length_proto->set_value("3");
+  ret = constant_parser.ParseExternalWeight(tensor_proto, tensor);
   EXPECT_EQ(ret, SUCCESS);
-
-  // check location
-  std::string attr_value;
-  ge::NamedAttrs attrs;
-  AttrUtils::GetNamedAttrs(op_desc_src, "file_constant_path", attrs);
-  AttrUtils::GetStr(attrs, "location", attr_value);
-  EXPECT_EQ(attr_value, "/usr/local");
+  auto tensor_size = tensor.GetSize();
+  EXPECT_EQ(tensor_size, 3);
+  auto tensor_data0 = tensor.GetData()[0];
+  EXPECT_EQ(tensor_data0, static_cast<uint8_t>(0));
+  auto tensor_data1 = tensor.GetData()[1];
+  EXPECT_EQ(tensor_data1, static_cast<uint8_t>(1));
+  auto tensor_data2 = tensor.GetData()[2];
+  EXPECT_EQ(tensor_data2, static_cast<uint8_t>(2));
 }
 
-TEST_F(UtestOnnxParser, FileConstantParseParam)
+TEST_F(UtestOnnxParser, OnnxConstantParser_ParseParams_test)
 {
-  OnnxFileConstantParser parser;
+  std::string case_dir = __FILE__;
+  case_dir = case_dir.substr(0, case_dir.find_last_of("/"));
+  std::string external_weight_file = case_dir + "/onnx_model/file_constant_weight.bin";
+
+  OnnxConstantParser constant_parser;
   ge::onnx::NodeProto input_node;
-  ge::OpDescPtr op_desc_src = std::make_shared<ge::OpDesc>("file_constant", "FileConstant");
+  ge::OpDescPtr op_desc_src = std::make_shared<ge::OpDesc>("Constant", "const.onnx");
   ge::Operator op = ge::OpDescUtils::CreateOperatorFromOpDesc(op_desc_src);
 
-  // get tensor proto failed
-  auto ret = parser.ParseParams(reinterpret_cast<Message *>(&input_node), op);
-  EXPECT_EQ(ret, FAILED);
-
-  ge::onnx::TensorProto tensor_proto;
   ge::onnx::AttributeProto *attribute = input_node.add_attribute();
   attribute->set_name("value");
   ge::onnx::TensorProto *attribute_tensor = attribute->mutable_t();
-  *attribute_tensor = tensor_proto;
 
   // parse data type failed
   attribute_tensor->set_data_type(OnnxDataType::UNDEFINED);
-  ret = parser.ParseParams(reinterpret_cast<Message *>(&input_node), op);
+  auto ret = constant_parser.ParseParams(reinterpret_cast<Message *>(&input_node), op);
   EXPECT_EQ(ret, FAILED);
 
-  // parse path failed
-  attribute_tensor->set_data_type(OnnxDataType::UINT16);
-  ret = parser.ParseParams(reinterpret_cast<Message *>(&input_node), op);
+  // without location, error
+  attribute_tensor->set_data_type(OnnxDataType::UINT8);
+  attribute_tensor->set_data_location(ge::onnx::TensorProto_DataLocation_EXTERNAL);
+  ret = constant_parser.ParseParams(reinterpret_cast<Message *>(&input_node), op);
   EXPECT_EQ(ret, FAILED);
 
   // success
   ge::onnx::StringStringEntryProto *string_proto = attribute_tensor->add_external_data();
   string_proto->set_key("location");
-  string_proto->set_value("/usr/local");
-  attribute_tensor->add_dims(4);
-  ret = parser.ParseParams(reinterpret_cast<Message *>(&input_node), op);
+  string_proto->set_value(external_weight_file);
+  attribute_tensor->add_dims(3);
+  ret = constant_parser.ParseParams(reinterpret_cast<Message *>(&input_node), op);
   EXPECT_EQ(ret, SUCCESS);
 
-  // check location, shape, dtype
-  NamedAttrs attrs;
-  AttrUtils::GetNamedAttrs(*op_desc_src, "file_constant_path", attrs);
-  std::string file_path;
-  AttrUtils::GetStr(attrs, "location", file_path);
-  EXPECT_EQ(file_path, "/usr/local");
-
+  // check tensor value
+  ge::Tensor tensor;
+  op.GetAttr("value", tensor);
+  auto tensor_size = tensor.GetSize();
+  EXPECT_EQ(tensor_size, 3);
+  auto tensor_data0 = tensor.GetData()[0];
+  EXPECT_EQ(tensor_data0, static_cast<uint8_t>(0));
+  auto tensor_data1 = tensor.GetData()[1];
+  EXPECT_EQ(tensor_data1, static_cast<uint8_t>(1));
+  auto tensor_data2 = tensor.GetData()[2];
+  EXPECT_EQ(tensor_data2, static_cast<uint8_t>(2));
+
+  // check shape, dtype
   std::vector<int64_t> dims;
-  op.GetAttr("shape", dims);
-  EXPECT_EQ(dims.size(), 1);
-  if (!dims.empty()) {
-    EXPECT_EQ(dims[0], 4);
-  }
-  DataType dtype;
-  op.GetAttr("dtype", dtype);
-  EXPECT_EQ(dtype, ge::DataType::DT_UINT16);
+  dims = tensor.GetTensorDesc().GetShape().GetDims();
+  ASSERT_EQ(dims.size(), 1);
+  EXPECT_EQ(dims[0], 3);
+  DataType dtype = tensor.GetTensorDesc().GetDataType();
+  EXPECT_EQ(dtype, ge::DataType::DT_UINT8);
 }
 
 TEST_F(UtestOnnxParser, OnnxModelParser_ParseInput_test)
@@ -598,16 +516,6 @@ TEST_F(UtestOnnxParser, OnnxModelParser_ParseInput_test)
   EXPECT_EQ(ret, domi::FAILED);
 }
 
-TEST_F(UtestOnnxParser, OnnxModelParser_ParseConstant_test)
-{
-  OnnxModelParser model_parser;
-  ge::onnx::GraphProto onnx_graph = CreateOnnxGraph();
-
-  model_parser.UpdateNodeNameAndOpType(onnx_graph);
-  std::string type = onnx_graph.mutable_node(0)->op_type();
-  EXPECT_EQ(type, kFileConstant);
-}
-
 TEST_F(UtestOnnxParser, onnx_test_ConstructOriType)
 {
   ge::onnx::ModelProto model_proto;