diff --git a/parser/common/acl_graph_parser_util.cc b/parser/common/acl_graph_parser_util.cc
index f9cc5c9..384d0c5 100644
--- a/parser/common/acl_graph_parser_util.cc
+++ b/parser/common/acl_graph_parser_util.cc
@@ -310,16 +310,16 @@ domi::Status AclGrphParseUtil::AclParserInitialize(const std::map<std::string, s
   return SUCCESS;
 }
 
-bool AclGrphParseUtil::CheckAclInputFormat(const string &input_format) {
+bool AclGrphParseUtil::CheckAclInputFormat(string &input_format) {
   if (input_format.empty()) {
     // Set default format
-    if (ge::GetParserContext().type = domi::TENSORFLOW) {
+    if (ge::GetParserContext().type == domi::TENSORFLOW) {
       input_format = "NHWC";
     } else {
       input_format = "NCHW";
     }
     return true;
-  } else if (ge::GetParserContext().type = domi::CAFFE) { // caffe
+  } else if (ge::GetParserContext().type == domi::CAFFE) { // caffe
     if (kCaffeSupportInputFormatSet.find(input_format) != kCaffeSupportInputFormatSet.end()) {
       return true;
     }
@@ -329,7 +329,7 @@ bool AclGrphParseUtil::CheckAclInputFormat(const string &input_format) {
     GELOGE(ge::FAILED,
         "Invalid value for --input_format[%s], %s.", input_format.c_str(), kCaffeFormatSupport);
     return false;
-  } else if (ge::GetParserContext().type = domi::TENSORFLOW) { // tf
+  } else if (ge::GetParserContext().type ==domi::TENSORFLOW) { // tf
     if (kTfSupportInputFormatSet.find(input_format) != kTfSupportInputFormatSet.end()) {
       return true;
     }
@@ -343,7 +343,7 @@ bool AclGrphParseUtil::CheckAclInputFormat(const string &input_format) {
   return true;
 }
 
-domi::Status AclGrphParseUtil::ParseAclFormat(const string &input_format) {
+domi::Status AclGrphParseUtil::ParseAclFormat(string &input_format) {
   ge::GetParserContext().format = domi::DOMI_TENSOR_ND;
   if (!CheckAclInputFormat(input_format)) {
     GELOGE(PARAM_INVALID, "Check input_format failed");
diff --git a/parser/common/acl_graph_parser_util.h b/parser/common/acl_graph_parser_util.h
index 10947fe..2eb4589 100644
--- a/parser/common/acl_graph_parser_util.h
+++ b/parser/common/acl_graph_parser_util.h
@@ -53,8 +53,8 @@ class AclGrphParseUtil {
   void GetOutputNodesNameAndIndex(std::vector<std::pair<ge::NodePtr, int32_t>> &output_nodes_info,
                                   std::vector<std::string> &output_nodes_name);
   domi::Status ParseAclLogLevel(const std::string &log);
-  bool CheckAclInputFormat(const string &input_format);
-  domi::Status ParseAclFormat(const std::string &input_format);
+  bool CheckAclInputFormat(string &input_format);
+  domi::Status ParseAclFormat(std::string &input_format);
   bool ParseInputShape(const std::string &input_shape,
                        std::unordered_map<std::string, vector<int64_t>> &shape_map,
                        vector<pair<std::string, vector<int64_t>>> &user_shape_map,