diff --git a/tf_adapter/util/ge_plugin.cc b/tf_adapter/util/ge_plugin.cc
index a74f3be574d4198780799ce4be9f692b85a1bcee..dbad404f2a8a54141e184f9090b263c41e0e9287 100644
--- a/tf_adapter/util/ge_plugin.cc
+++ b/tf_adapter/util/ge_plugin.cc
@@ -268,7 +268,10 @@ uint64_t GePlugin::GetFusionTensorSize() {
     return default_fusion_tensor_size;
   }
   std::string temp_fusion_tensor_size(env_fusion_tensor_size);
-  std::istringstream string_stream(temp_fusion_tensor_size);
+  std::istringstream string_stream;
+  if (!temp_fusion_tensor_size.empty()) {
+    string_stream.str(temp_fusion_tensor_size);
+  }
   uint64_t fusion_tensor_size = 0;
   if (!(string_stream >> fusion_tensor_size)) {
     fusion_tensor_size = default_fusion_tensor_size;
diff --git a/tf_adapter_2.x/npu_device/core/npu_parser.h b/tf_adapter_2.x/npu_device/core/npu_parser.h
index 8cc4ac61e51967aa64a7db24d4f5625710c1d8d4..484802f47b5c17e1a9bac0a8a6d2b5e28e5ed883 100644
--- a/tf_adapter_2.x/npu_device/core/npu_parser.h
+++ b/tf_adapter_2.x/npu_device/core/npu_parser.h
@@ -117,13 +117,13 @@ __attribute__((unused)) static void AssembleOpDef(tensorflow::Node *n) {
   n->AddAttr("op_def", serialized_op_def);
 }
 
-static void AssembleOpDef(const tensorflow::OpRegistrationData *op_data, tensorflow::NodeDef *ndef) {
+__attribute__((unused)) static void AssembleOpDef(const tensorflow::OpRegistrationData *op_data, tensorflow::NodeDef *ndef) {
   std::string serialized_op_def;
   op_data->op_def.SerializeToString(&serialized_op_def);
   tensorflow::AddNodeAttr("op_def", serialized_op_def, ndef);
 }
 
-static void AssembleOpDef(tensorflow::NodeDef *ndef) {
+__attribute__((unused)) static void AssembleOpDef(tensorflow::NodeDef *ndef) {
   const tensorflow::OpRegistrationData *op_reg_data;
   tensorflow::OpRegistry::Global()->LookUp(ndef->op(), &op_reg_data);
   std::string serialized_op_def;