diff --git a/ge/graph/preprocess/graph_preprocess.cc b/ge/graph/preprocess/graph_preprocess.cc
index d7f33b4b..8d59d9f9 100644
--- a/ge/graph/preprocess/graph_preprocess.cc
+++ b/ge/graph/preprocess/graph_preprocess.cc
@@ -415,16 +415,16 @@ Status UpdateVarFormats(const NodePtr &var, const GeTensorDesc &tensor_desc) {
 
 Status RecoverTransRoadForVar(const NodePtr &var, const VarTransRoad &road) {
   GE_CHECK_NOTNULL(var);
-  int index = 0;
+  static std::atomic_int index(0);
   NodePtr last_node = var;
   for (auto iter = road.rbegin(); iter != road.rend(); ++iter) {
     auto trans_name = var->GetName() + "_trans_" + std::to_string(index++);
     auto ret = RecoverOneTransNodeForVar(trans_name, *iter, last_node, last_node);
     if (ret != SUCCESS) {
-      REPORT_CALL_ERROR("E19999", "Failed to recover trans node for variable %s, index %d, type %s",
-                        var->GetName().c_str(), index, iter->node_type.c_str());
-      GELOGE(INTERNAL_ERROR, "[Recover][TransNode] for variable %s, index %d, type %s", var->GetName().c_str(),
-             index, iter->node_type.c_str());
+      REPORT_CALL_ERROR("E19999", "Failed to recover trans node for variable %s, index %s, type %s",
+                        var->GetName().c_str(), std::to_string(index).c_str(), iter->node_type.c_str());
+      GELOGE(INTERNAL_ERROR, "[Recover][TransNode] for variable %s, index %s, type %s", var->GetName().c_str(),
+             std::to_string(index).c_str(), iter->node_type.c_str());
       return INTERNAL_ERROR;
     }
     // set stream_label
@@ -460,17 +460,17 @@ Status RecoverTransRoadForVar(const NodePtr &var, const VarTransRoad &road) {
 Status RecoverTransRoadForVarRef(const std::set<NodePtr> &nodes, const VarTransRoad &road) {
   for (auto &var : nodes) {
     GE_CHECK_NOTNULL(var);
-    int index = 0;
+    static std::atomic_int index(0);
     NodePtr last_node = var;
     GELOGI("Recover trans nodes for variable ref %s", var->GetName().c_str());
     for (auto iter = road.rbegin(); iter != road.rend(); ++iter) {
       auto trans_name = var->GetName() + "_trans_" + std::to_string(index++);
       auto ret = RecoverOneTransNodeForVarRef(trans_name, *iter, last_node, last_node);
       if (ret != SUCCESS) {
-        REPORT_CALL_ERROR("E19999", "Failed to recover trans node for variable %s, index %d, type %s",
-                          var->GetName().c_str(), index, iter->node_type.c_str());
-        GELOGE(INTERNAL_ERROR, "[Recover][TransNode] for variable %s failed, index %d, type %s",
-               var->GetName().c_str(), index, iter->node_type.c_str());
+        REPORT_CALL_ERROR("E19999", "Failed to recover trans node for variable %s, index %s, type %s",
+                          var->GetName().c_str(), std::to_string(index).c_str(), iter->node_type.c_str());
+        GELOGE(INTERNAL_ERROR, "[Recover][TransNode] for variable %s failed, index %s, type %s",
+               var->GetName().c_str(), std::to_string(index).c_str(), iter->node_type.c_str());
         return INTERNAL_ERROR;
       }
       // set stream_label
diff --git a/tests/ut/ge/graph/preprocess/graph_preprocess_unittest.cc b/tests/ut/ge/graph/preprocess/graph_preprocess_unittest.cc
index e53a9f96..b1c07d81 100644
--- a/tests/ut/ge/graph/preprocess/graph_preprocess_unittest.cc
+++ b/tests/ut/ge/graph/preprocess/graph_preprocess_unittest.cc
@@ -23,6 +23,7 @@
 #include "graph/passes/graph_builder_utils.h"
 #include "graph/utils/attr_utils.h"
 #include "graph/debug/ge_attr_define.h"
+#include "graph/manager/graph_var_manager.h"
 
 #define private public
 #define protected public
@@ -285,4 +286,26 @@ TEST_F(UtestGraphPreproces, test_prepare_dyn_shape) {
   GraphPrepare graph_prepare;
   EXPECT_EQ(graph_prepare.PrepareDynShape(graph_node, user_input, compute_graph, 0), SUCCESS);
 }
+
+TEST_F(UtestGraphPreproces, test_updar_variable_formats) {
+  auto builder = ut::GraphBuilder("g1");
+  auto var = builder.AddNode("var", VARIABLE, 1, 1);
+  auto g1 = builder.GetGraph();
+  g1->SetSessionID(0);
+  TransNodeInfo trans_node_info;
+  VarTransRoad fusion_road;
+  fusion_road.emplace_back(trans_node_info);
+  VarManager::Instance(g1->GetSessionID())->SetTransRoad(var->GetName(), fusion_road);
+  GraphPrepare graph_prepare;
+  EXPECT_EQ(graph_prepare.UpdateVariableFormats(g1), INTERNAL_ERROR);
+
+  auto builder1 = ut::GraphBuilder("g2");
+  auto var1 = builder1.AddNode("var1", VARIABLE, 1, 1);
+  auto g2 = builder1.GetGraph();
+  g2->SetSessionID(0);
+  VarTransRoad fusion_road1;
+  VarManager::Instance(g2->GetSessionID())->SetTransRoad(var1->GetName(), fusion_road1);
+  AttrUtils::SetStr(var1->GetOpDesc(), REF_VAR_SRC_VAR_NAME, "var1");
+  EXPECT_EQ(graph_prepare.UpdateVariableFormats(g2), SUCCESS);
+}
 }
\ No newline at end of file