diff --git a/parser/tensorflow/tensorflow_parser.cc b/parser/tensorflow/tensorflow_parser.cc
index f188a97..25edff9 100644
--- a/parser/tensorflow/tensorflow_parser.cc
+++ b/parser/tensorflow/tensorflow_parser.cc
@@ -54,6 +54,7 @@
 #include "register/op_registry.h"
 #include "register/scope/scope_graph_impl.h"
 #include "register/scope/scope_pass_registry_impl.h"
+#include "parser/common/auto_mapping_subgraph_io_index_func.h"
 
 using ge::const_op_update_vec;
 using ge::OpParserFactory;
@@ -302,6 +303,80 @@ Status PostOpProcessForSubgraph(const ParseArg &arg) {
   }
   return SUCCESS;
 }
+
+Status MappingAndAddSubGraph(const NodePtr &node, const Graph &graph, ComputeGraphPtr &root_graph){
+  // Inner function, input params have been checked by caller
+  Status status = AutoMappingSubgraphIndexByDataNodeAndOutputNodesInfo(graph,
+                                                                       [](int in, int &out)->Status {
+                                                                         out = in;
+                                                                         return SUCCESS;
+                                                                       },
+                                                                       [](int in, int &out)->Status {
+                                                                         out = in;
+                                                                         return SUCCESS;
+                                                                       });
+  if (status != SUCCESS) {
+    GELOGE(INTERNAL_ERROR, "[Mapping][Subgraph]node:%s, sub graph name:%s.",
+           node->GetName().c_str(), graph.GetName().c_str());
+    REPORT_CALL_ERROR("E19999", "Failed to map sub graph input and output, node:%s, sub graph name:%s.",
+                      node->GetName().c_str(), graph.GetName().c_str());
+    return INTERNAL_ERROR;
+  }
+
+  ComputeGraphPtr compute_graph = GraphUtils::GetComputeGraph(graph);
+  GE_CHECK_NOTNULL(compute_graph);
+  // Inner function, GetOpDesc has been checked by caller
+  (void)node->GetOpDesc()->AddSubgraphName("f");
+  auto ret = NodeUtils::SetSubgraph(*node, 0, compute_graph);
+  if (ret != GRAPH_SUCCESS) {
+    GELOGE(INTERNAL_ERROR, "[Set][Subgraph]Node:%s, sub graph name:%s.",
+           node->GetName().c_str(), compute_graph->GetName().c_str());
+    REPORT_CALL_ERROR("E19999", "Failed to set sub graph, node: %s, sub graph name: %s.",
+                      node->GetName().c_str(), compute_graph->GetName().c_str());
+    return INTERNAL_ERROR;
+  }
+  for (const auto &sub_graph : compute_graph->GetAllSubgraphs()) {
+    ret = root_graph->AddSubGraph(sub_graph);
+    if (ret != GRAPH_SUCCESS) {
+      GELOGE(INTERNAL_ERROR, "[Add][Subgraph]Node:%s, sub graph name:%s, sub sub graph name:%s.",
+             node->GetName().c_str(), compute_graph->GetName().c_str(), sub_graph->GetName().c_str());
+      REPORT_CALL_ERROR("E19999", "Failed to add sub graph to root graph, node:%s, sub graph name:%s.",
+                        node->GetName().c_str(), sub_graph->GetName().c_str());
+      return INTERNAL_ERROR;
+    }
+    compute_graph->RemoveSubgraph(sub_graph);
+    GELOGD("Add subgraph[%s] to root graph[%s].", sub_graph->GetName().c_str(), root_graph->GetName().c_str());
+  }
+  return SUCCESS;
+}
+
+Status AddExternalGraph(ComputeGraphPtr &root_graph) {
+  GE_CHECK_NOTNULL(root_graph);
+  for (const NodePtr &node : root_graph->GetAllNodes()) {
+    if (node == nullptr || node->GetOpDesc() == nullptr) {
+      continue;
+    }
+    std::string model_data;
+    if (AttrUtils::GetStr(node->GetOpDesc(), "_external_model", model_data) && !model_data.empty()) {
+      ge::Model model;
+      auto load_ret = ge::Model::Load(reinterpret_cast<const uint8_t *>(model_data.data()), model_data.size(), model);
+      if (load_ret != GRAPH_SUCCESS) {
+        GELOGE(INTERNAL_ERROR, "[Parse][ExternalModel]Node:%s.", node->GetName().c_str());
+        REPORT_CALL_ERROR("E19999", "Failed to parse external model, node:%s.", node->GetName().c_str());
+        return INTERNAL_ERROR;
+      }
+      Graph graph = model.GetGraph();
+      GELOGD("Get subgraph[%s] from model[%s].", graph.GetName().c_str(), node->GetName().c_str());
+      Status ret = MappingAndAddSubGraph(node, graph, root_graph);
+      if (ret != SUCCESS) {
+        GELOGE(INTERNAL_ERROR, "[Mapping][Subgraph]Node:%s.", node->GetName().c_str());
+        REPORT_CALL_ERROR("E19999", "Failed to map and add sub graph, node:%s.", node->GetName().c_str());
+        return INTERNAL_ERROR;
+      }
+    }
+  }
+  return SUCCESS;
+}
 }  // namespace
 
 /**
@@ -2397,6 +2472,11 @@ Status TensorFlowModelParser::ParseProtoWithSubgraph(const google::protobuf::Mes
       return ret;
     }
   }
+  auto add_ret = AddExternalGraph(root_graph);
+  if (add_ret != SUCCESS) {
+    GELOGE(add_ret, "Failed to add external graph for root graph %s.", root_graph->GetName().c_str());
+    return add_ret;
+  }
   PARSER_TIMESTAMP_EVENT_END(ParseProtoWithSubgraph, "TensorFlowModelParser::ParseProtoWithSubgraph");
   return SUCCESS;
 }
@@ -2460,6 +2540,11 @@ Status TensorFlowModelParser::ParseProtoWithSubgraph(const std::string &root_pro
       return ret;
     }
   }
+  auto add_ret = AddExternalGraph(root_graph);
+  if (add_ret != SUCCESS) {
+    GELOGE(add_ret, "Failed to add external graph for root graph %s.", root_graph->GetName().c_str());
+    return add_ret;
+  }
   PARSER_TIMESTAMP_EVENT_END(ParseProtoWithSubgraph, "TensorFlowModelParser::ParseProtoWithSubgraph");
   return SUCCESS;
 }