diff --git a/ge/common/ge/plugin_manager.cc b/ge/common/ge/plugin_manager.cc
index 38de251e..4e588f29 100644
--- a/ge/common/ge/plugin_manager.cc
+++ b/ge/common/ge/plugin_manager.cc
@@ -53,6 +53,7 @@ string PluginManager::GetPath() {
     GELOGW("Failed to read the shared library file path!");
     return string();
   } else {
+    GE_IF_BOOL_EXEC(dl_info.dli_fname == nullptr, return string());
     std::string so_path = dl_info.dli_fname;
     char path[MMPA_MAX_PATH] = {0};
     if (so_path.length() >= MMPA_MAX_PATH) {
diff --git a/ge/generator/ge_generator.cc b/ge/generator/ge_generator.cc
index 072880fa..32d9e5a1 100644
--- a/ge/generator/ge_generator.cc
+++ b/ge/generator/ge_generator.cc
@@ -671,6 +671,8 @@ Status GeGenerator::CheckForSingleOp(OpDescPtr &op_desc, const vector<GeTensor>
 Status GeGenerator::BuildSingleOp(OpDescPtr &op_desc, const vector<GeTensor> &inputs, const vector<GeTensor> &outputs,
                                   const string &model_file_name, OpEngineType engine_type, ModelBufferData &model_buff,
                                   bool is_offline) {
+  GE_CHECK_NOTNULL_EXEC(impl_, return PARAM_INVALID);
+  impl_->is_offline_ = is_offline;
   if (!is_offline) {
     (void)AttrUtils::SetBool(op_desc, ATTR_SINGLE_OP_SCENE, true);
   }
@@ -709,8 +711,6 @@ Status GeGenerator::BuildSingleOp(OpDescPtr &op_desc, const vector<GeTensor> &in
   GELOGI("ATC parser success in single op build.");
 
   GeRootModelPtr ge_root_model = nullptr;
-  GE_CHECK_NOTNULL_EXEC(impl_, return PARAM_INVALID);
-  impl_->is_offline_ = is_offline;
   GE_CHK_STATUS_RET_NOLOG(impl_->BuildModel(graph, inputs, ge_root_model));
   map<string, GeAttrValue> op_attrs = op_desc_tmp->GetAllAttrs();
   GE_CHECK_NOTNULL(ge_root_model);
@@ -758,7 +758,7 @@ Status GeGenerator::BuildSingleOpModel(OpDescPtr &op_desc, const vector<GeTensor
   ModelBufferData model_buff;
   OpEngineType engine_type = ENGINE_SYS;
   Status status = BuildSingleOp(op_desc, inputs, outputs, model_file_name, engine_type, model_buff, true);
-  GELOGI("Finish build single offline model");
+  GELOGI("Finish build single offline model, status: %u", status);
   return status;
 }
 
@@ -777,7 +777,7 @@ Status GeGenerator::BuildSingleOpModel(OpDescPtr &op_desc, const vector<GeTensor
                                        ModelBufferData &model_buff) {
   GELOGI("Start to build single op online, input size: %zu, output size: %zu", inputs.size(), outputs.size());
   Status status = BuildSingleOp(op_desc, inputs, outputs, kFileNameSuffix, engine_type, model_buff, false);
-  GELOGI("Finish build single online model");
+  GELOGI("Finish build single online model, status: %u", status);
   return status;
 }
 
diff --git a/tests/ut/ge/CMakeLists.txt b/tests/ut/ge/CMakeLists.txt
index a09d5789..184403ed 100755
--- a/tests/ut/ge/CMakeLists.txt
+++ b/tests/ut/ge/CMakeLists.txt
@@ -18,23 +18,23 @@ project(ut_ge)
 set(CMAKE_CXX_STANDARD 11)
 
 set(PROTO_LIST
-        "${GE_CODE_DIR}/metadef/proto/om.proto"
-        "${GE_CODE_DIR}/metadef/proto/ge_ir.proto"
-        "${GE_CODE_DIR}/metadef/proto/ge_api.proto"
-        "${GE_CODE_DIR}/metadef/proto/insert_op.proto"
-        "${GE_CODE_DIR}/metadef/proto/dump_task.proto"
-        "${GE_CODE_DIR}/metadef/proto/fwk_adapter.proto"
-        "${GE_CODE_DIR}/metadef/proto/op_mapping_info.proto"
-        "${GE_CODE_DIR}/metadef/proto/optimizer_priority.proto"
-        "${GE_CODE_DIR}/metadef/proto/ge_api.proto"
-        "${GE_CODE_DIR}/metadef/proto/tensorflow/attr_value.proto"
-        "${GE_CODE_DIR}/metadef/proto/tensorflow/tensor.proto"
-        "${GE_CODE_DIR}/metadef/proto/tensorflow/resource_handle.proto"
-        "${GE_CODE_DIR}/metadef/proto/tensorflow/tensor_shape.proto"
-        "${GE_CODE_DIR}/metadef/proto/tensorflow/types.proto"
-        "${GE_CODE_DIR}/metadef/proto/tensorflow/node_def.proto"
-        "${GE_CODE_DIR}/metadef/proto/proto_inner/ge_onnx.proto"
-        )
+    "${GE_CODE_DIR}/metadef/proto/om.proto"
+    "${GE_CODE_DIR}/metadef/proto/ge_ir.proto"
+    "${GE_CODE_DIR}/metadef/proto/ge_api.proto"
+    "${GE_CODE_DIR}/metadef/proto/insert_op.proto"
+    "${GE_CODE_DIR}/metadef/proto/dump_task.proto"
+    "${GE_CODE_DIR}/metadef/proto/fwk_adapter.proto"
+    "${GE_CODE_DIR}/metadef/proto/op_mapping_info.proto"
+    "${GE_CODE_DIR}/metadef/proto/optimizer_priority.proto"
+    "${GE_CODE_DIR}/metadef/proto/ge_api.proto"
+    "${GE_CODE_DIR}/metadef/proto/tensorflow/attr_value.proto"
+    "${GE_CODE_DIR}/metadef/proto/tensorflow/tensor.proto"
+    "${GE_CODE_DIR}/metadef/proto/tensorflow/resource_handle.proto"
+    "${GE_CODE_DIR}/metadef/proto/tensorflow/tensor_shape.proto"
+    "${GE_CODE_DIR}/metadef/proto/tensorflow/types.proto"
+    "${GE_CODE_DIR}/metadef/proto/tensorflow/node_def.proto"
+    "${GE_CODE_DIR}/metadef/proto/proto_inner/ge_onnx.proto"
+    )
 
 protobuf_generate(ge PROTO_SRCS PROTO_HDRS ${PROTO_LIST})
 
@@ -266,8 +266,8 @@ set(COMMON_SRC_FILES
     "${GE_CODE_DIR}/ge/graph/passes/hccl_group_pass.cc"
     "${GE_CODE_DIR}/ge/graph/passes/memcpy_addr_async_pass.cc"
     "${GE_CODE_DIR}/ge/graph/passes/set_input_output_offset_pass.cc"
-	"${GE_CODE_DIR}/ge/graph/passes/remove_same_const_pass.cc"
-	"${GE_CODE_DIR}/ge/graph/passes/useless_control_out_remove_pass.cc"
+    "${GE_CODE_DIR}/ge/graph/passes/remove_same_const_pass.cc"
+    "${GE_CODE_DIR}/ge/graph/passes/useless_control_out_remove_pass.cc"
     "${GE_CODE_DIR}/ge/model/ge_model.cc"
     "${GE_CODE_DIR}/ge/common/cust_aicpu_kernel_store.cc"
     "${GE_CODE_DIR}/ge/graph/load/model_manager/model_utils.cc"
@@ -627,7 +627,7 @@ set(DISTINCT_GRAPH_LOAD_TEST_FILES
     #"graph/load/new_model_manager_davinci_model_unittest.cc"
     "graph/load/model_manager_unittest.cc"
     #"graph/load/new_model_manager_task_build_unittest.cc"
-	"graph/load/new_model_manager_model_manager_aicpu_unittest.cc"
+    "graph/load/new_model_manager_model_manager_aicpu_unittest.cc"
     "graph/load/end_graph_task_unittest.cc"
     "graph/load/new_model_manager_event_manager_unittest.cc"
     #"graph/load/output_net_output_unittest.cc"
@@ -638,7 +638,7 @@ set(DISTINCT_GRAPH_LOAD_TEST_FILES
     "graph/load/kernel_task_info_unittest.cc"
     "graph/load/memcpy_addr_async_task_info_unittest.cc"
     "graph/load/memcpy_async_task_info_unittest.cc"
-	"graph/load/cpu_queue_schedule_unittest.cc"
+    "graph/load/cpu_queue_schedule_unittest.cc"
     #"graph/graph_load_unittest.cc"
     "graph/ge_executor_unittest.cc"
     "graph/load/model_helper_unittest.cc"
@@ -671,7 +671,7 @@ set(PASS_TEST_FILES
     "graph/passes/trans_op_depth_fusion_pass_unittest.cc"
     "graph/passes/transop_nearby_allreduce_fusion_pass_unittest.cc"
     "graph/passes/constant_folding_pass_unittest.cc"
-	"graph/passes/fuse_data_nodes_with_common_input_pass_unittest.cc"
+    "graph/passes/fuse_data_nodes_with_common_input_pass_unittest.cc"
     "graph/passes/stop_gradient_pass_unittest.cc"
     "graph/passes/prevent_gradient_pass_unittest.cc"
     "graph/passes/identity_pass_unittest.cc"
@@ -755,6 +755,10 @@ set(MULTI_PARTS_TEST_FILES
     "session/omg_omg_unittest.cc"
 )
 
+set(GENERATOR_TEST_FILES
+    "generator/ge_generator_unittest.cc"
+)
+
 set(SINGLE_OP_TEST_FILES
     #"single_op/single_op_model_unittest.cc"
     "single_op/single_op_manager_unittest.cc"
@@ -1055,6 +1059,7 @@ target_link_libraries(ut_libge_kernel_utest
 # libge_distinct_load_utest
 add_executable(ut_libge_distinct_load_utest
         ${COMMON_TEST_FILES}
+        ${GENERATOR_TEST_FILES}
         ${DISTINCT_GRAPH_LOAD_TEST_FILES}
         ${DISTINCT_GRAPH_LOAD_SRC_FILES}
         ${SINGLE_OP_TEST_FILES}
diff --git a/tests/ut/ge/generator/ge_generator_unittest.cc b/tests/ut/ge/generator/ge_generator_unittest.cc
new file mode 100644
index 00000000..509b71c8
--- /dev/null
+++ b/tests/ut/ge/generator/ge_generator_unittest.cc
@@ -0,0 +1,76 @@
+/**
+ * Copyright 2019-2020 Huawei Technologies Co., Ltd
+ *
+ * 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 <gtest/gtest.h>
+
+#define private public
+#define protected public
+#include "generator/ge_generator.h"
+#include "graph/utils/tensor_utils.h"
+
+using namespace std;
+
+namespace ge {
+class UtestGeGenerator : public testing::Test {
+ protected:
+  void SetUp() {}
+
+  void TearDown() {}
+};
+
+TEST_F(UtestGeGenerator, test_build_single_op_offline) {
+  GeTensorDesc tensor_desc(GeShape(), FORMAT_NCHW, DT_FLOAT);
+  TensorUtils::SetSize(tensor_desc, 512);
+
+  shared_ptr<OpDesc> op_desc = make_shared<OpDesc>("Add", "add");
+  EXPECT_EQ(op_desc->AddInputDesc(tensor_desc), GRAPH_SUCCESS);
+  EXPECT_EQ(op_desc->AddInputDesc(tensor_desc), GRAPH_SUCCESS);
+  EXPECT_EQ(op_desc->AddOutputDesc(tensor_desc), GRAPH_SUCCESS);
+
+  GeTensor tensor(tensor_desc);
+  const vector<GeTensor> inputs = { tensor, tensor };
+  const vector<GeTensor> outputs = { tensor };
+
+  // not Initialize, impl is null.
+  GeGenerator generator;
+  EXPECT_EQ(generator.BuildSingleOpModel(op_desc, inputs, outputs, "offline_"), PARAM_INVALID);
+
+  // const map<string, string> &options
+  generator.Initialize({});
+  EXPECT_EQ(generator.BuildSingleOpModel(op_desc, inputs, outputs, "offline_"), GE_GENERATOR_GRAPH_MANAGER_BUILD_GRAPH_FAILED);
+}
+
+TEST_F(UtestGeGenerator, test_build_single_op_online) {
+  GeTensorDesc tensor_desc(GeShape(), FORMAT_NCHW, DT_FLOAT);
+  TensorUtils::SetSize(tensor_desc, 512);
+
+  shared_ptr<OpDesc> op_desc = make_shared<OpDesc>("Add", "add");
+  EXPECT_EQ(op_desc->AddInputDesc(tensor_desc), GRAPH_SUCCESS);
+  EXPECT_EQ(op_desc->AddInputDesc(tensor_desc), GRAPH_SUCCESS);
+  EXPECT_EQ(op_desc->AddOutputDesc(tensor_desc), GRAPH_SUCCESS);
+
+  GeTensor tensor(tensor_desc);
+  const vector<GeTensor> inputs = { tensor, tensor };
+  const vector<GeTensor> outputs = { tensor };
+
+  // not Initialize, impl is null.
+  GeGenerator generator;
+  generator.Initialize({});
+  ModelBufferData model_buffer;
+  EXPECT_EQ(generator.BuildSingleOpModel(op_desc, inputs, outputs, ENGINE_SYS, model_buffer), GE_GENERATOR_GRAPH_MANAGER_BUILD_GRAPH_FAILED);
+}
+
+}  // namespace ge