diff --git a/ge/graph/common/transop_util.cc b/ge/graph/common/transop_util.cc
index c86e69dd..9b513fe6 100755
--- a/ge/graph/common/transop_util.cc
+++ b/ge/graph/common/transop_util.cc
@@ -85,8 +85,8 @@ bool TransOpUtil::CheckPrecisionLoss(const ge::NodePtr &src_node) {
 
 std::string TransOpUtil::TransopMapToString() {
   std::string buffer;
-  for (auto it = transop_index_map_.begin(); it != transop_index_map_.end(); ++it) {
-    buffer += it->first + " ";
+  for (auto &key : Instance().transop_index_map_) {
+    buffer += key.first + " ";
   }
   return buffer;
 }
diff --git a/ge/graph/common/transop_util.h b/ge/graph/common/transop_util.h
index 6284f754..3332e1fb 100644
--- a/ge/graph/common/transop_util.h
+++ b/ge/graph/common/transop_util.h
@@ -35,7 +35,7 @@ class GE_FUNC_HOST_VISIBILITY GE_FUNC_DEV_VISIBILITY TransOpUtil {
 
   static bool CheckPrecisionLoss(const NodePtr &src_node);
 
-  std::string TransopMapToString();
+  static std::string TransopMapToString();
 
  private:
   TransOpUtil();