diff --git a/tests/st/testcase/test_tensorflow_parser.cc b/tests/st/testcase/test_tensorflow_parser.cc
index 27199b1..549e85d 100644
--- a/tests/st/testcase/test_tensorflow_parser.cc
+++ b/tests/st/testcase/test_tensorflow_parser.cc
@@ -2663,6 +2663,13 @@ TEST_F(STestTensorflowParser, tensorflow_OptimizeIdentityByOutput_test)
   Status ret = model_parser.OptimizeIdentityByOutput(nodedef_map, curr_node_name, clear_input_flag);
   EXPECT_EQ(ret, INTERNAL_ERROR);
 
+
+  // op_node_context for fusion op
+  ge::OpNodeContext op_node_context;
+  op_node_context.input_map["pre_node_a"].push_back({0, 0});
+  op_node_context.input_map["pre_node_b"].push_back({0, 1});
+  tensorflow_parser.op_node_context_map_[fusion_op_name] = op_node_context;
+
   GraphDef graph;
   curr_node_name = "pre_node_a";
   nodedef_map.emplace("pre_node_a", node_def);
@@ -2673,6 +2680,57 @@ TEST_F(STestTensorflowParser, tensorflow_OptimizeIdentityByOutput_test)
   delete node_def;
 }
 
+TEST_F(STestTensorflowParser, tensorflow_OptimizeIdentityByOutput_test1)
+{
+  TensorFlowModelParser model_parser;
+  NodeDef *node_def = new NodeDef();
+  node_def->set_name("Placeholder");
+  node_def->set_op("Placeholder_0");
+  std::map<string, NodeDef *> nodedef_map;
+
+  curr_node_name = "pre_node_a";
+  nodedef_map.emplace("pre_node_b", node_def);
+  node_def->set_op("pre_node_a");
+  GenOriginContext(&model_parser, curr_node_name);
+  ret = model_parser.OptimizeIdentityByOutput(nodedef_map, curr_node_name, clear_input_flag);
+  EXPECT_EQ(ret, INTERNAL_ERROR);
+  delete node_def;
+}
+
+TEST_F(STestTensorflowParser, tensorflow_OptimizeIdentityByOutput_test1)
+{
+  TensorFlowModelParser model_parser;
+  NodeDef *node_def = new NodeDef();
+  node_def->set_name("Placeholder");
+  node_def->set_op("Placeholder_0");
+  std::map<string, NodeDef *> nodedef_map;
+
+  curr_node_name = "pre_node_a";
+  nodedef_map.emplace("pre_node_a", node_def);
+  node_def->set_op("pre_node_a");
+  GenOriginContext(&model_parser, curr_node_name);
+  ret = model_parser.OptimizeIdentityByOutput(nodedef_map, curr_node_name, clear_input_flag);
+  EXPECT_EQ(ret, INTERNAL_ERROR);
+  delete node_def;
+}
+
+TEST_F(STestTensorflowParser, tensorflow_OptimizeIdentityByOutput_test1)
+{
+  TensorFlowModelParser model_parser;
+  NodeDef *node_def = new NodeDef();
+  node_def->set_name("Retval_1");
+  node_def->set_op("_Retval");
+  std::map<string, NodeDef *> nodedef_map;
+
+  curr_node_name = "pre_node_a";
+  nodedef_map.emplace("pre_node_b", node_def);
+  node_def->set_op("pre_node_a");
+  GenOriginContext(&model_parser, curr_node_name);
+  ret = model_parser.OptimizeIdentityByOutput(nodedef_map, curr_node_name, clear_input_flag);
+  EXPECT_EQ(ret, SUCCESS);
+  delete node_def;
+}
+
 TEST_F(STestTensorflowParser, tensorflow_OptimizeSnapShot_test)
 {
   TensorFlowModelParser model_parser;
@@ -2863,6 +2921,7 @@ TEST_F(STestTensorflowParser, tensorflow_GraphDefOptimizeIdentity_test)
   Status ret = tensorflow_parser.GraphDefOptimizeIdentity(&graph_def, nodedef_map, nodedef_to_optimize);
   EXPECT_EQ(ret, ge::PARAM_INVALID);
 }
+
 TEST_F(STestTensorflowParser, tensorflow_optimizer_snapshot_no_retval_test) {
   std::string caseDir = __FILE__;
   std::size_t idx = caseDir.find_last_of("/");