diff --git a/mindspore/ccsrc/runtime/device/ascend/executor/tiling/op_tiling_adapter.cc b/mindspore/ccsrc/runtime/device/ascend/executor/tiling/op_tiling_adapter.cc
index 27c067effef..50e623a17db 100644
--- a/mindspore/ccsrc/runtime/device/ascend/executor/tiling/op_tiling_adapter.cc
+++ b/mindspore/ccsrc/runtime/device/ascend/executor/tiling/op_tiling_adapter.cc
@@ -71,7 +71,7 @@ std::string OpTilingCalculateAdapter::GetOutputName(const CNodePtr &node, size_t
 
 std::string OpTilingCalculateAdapter::GetInputName(const CNodePtr &node, size_t index) {
   MS_EXCEPTION_IF_NULL(node);
-  if (input_names_.size() < index) {
+  if (input_names_.size() <= index) {
     return "unknown_name";
   }
   return input_names_[index];
diff --git a/mindspore/ccsrc/runtime/hardware/ascend/ascend_device_context.cc b/mindspore/ccsrc/runtime/hardware/ascend/ascend_device_context.cc
index d2b6929c9f0..611fd2ac871 100644
--- a/mindspore/ccsrc/runtime/hardware/ascend/ascend_device_context.cc
+++ b/mindspore/ccsrc/runtime/hardware/ascend/ascend_device_context.cc
@@ -319,16 +319,16 @@ std::vector<GraphSegmentPtr> AscendDeviceContext::PartitionGraph(
 
 void AscendDeviceContext::UnifyMindIR(const KernelGraphPtr &graph) const {
   MS_EXCEPTION_IF_NULL(graph);
-  AscendGraphOptimization::GetInstance().UnifyMindIR(graph);
+  GetAscendGraphOptimization().UnifyMindIR(graph);
 }
 
 void AscendDeviceContext::OptimizeGraph(const KernelGraphPtr &graph) const {
   MS_EXCEPTION_IF_NULL(graph);
-  AscendGraphOptimization::GetInstance().OptimizeGraph(graph);
+  GetAscendGraphOptimization().OptimizeGraph(graph);
 }
 
 void AscendDeviceContext::SetOperatorInfo(const std::vector<CNodePtr> &nodes) const {
-  AscendGraphOptimization::GetInstance().SetOperatorInfo(nodes);
+  GetAscendGraphOptimization().SetOperatorInfo(nodes);
 }
 
 void AscendDeviceContext::CreateKernel(const std::vector<CNodePtr> &nodes) const {
@@ -618,7 +618,7 @@ bool AscendDeviceContext::IsLoopCountSink(const KernelGraphPtr &graph) const {
 
 // kernel by kernel mode interface
 void AscendDeviceContext::OptimizeSingleOpGraph(const KernelGraphPtr &graph) const {
-  AscendGraphOptimization::GetInstance().OptimizeSingleOpGraph(graph);
+  GetAscendGraphOptimization().OptimizeSingleOpGraph(graph);
 }
 
 void AscendDeviceContext::PreprocessBeforeRunSingleOpGraph(const KernelGraphPtr &graph) const {
diff --git a/mindspore/ccsrc/runtime/hardware/ascend/ascend_graph_optimization.cc b/mindspore/ccsrc/runtime/hardware/ascend/ascend_graph_optimization.cc
index e002a1ee6d1..32f7a4e8102 100644
--- a/mindspore/ccsrc/runtime/hardware/ascend/ascend_graph_optimization.cc
+++ b/mindspore/ccsrc/runtime/hardware/ascend/ascend_graph_optimization.cc
@@ -34,7 +34,7 @@ namespace mindspore {
 namespace device {
 namespace ascend {
 using AscendAutoMonad = mindspore::session::AscendAutoMonad;
-
+AscendGraphOptimization GetAscendGraphOptimization() { return AscendGraphOptimization(); }
 void AscendGraphOptimization::OptimizeGraph(const KernelGraphPtr &graph) {
   MS_EXCEPTION_IF_NULL(graph);
   MS_LOG(INFO) << "Status record: start optimize graph. graph id: " << graph->graph_id();
diff --git a/mindspore/ccsrc/runtime/hardware/ascend/ascend_graph_optimization.h b/mindspore/ccsrc/runtime/hardware/ascend/ascend_graph_optimization.h
index e311d4f3bce..423cd9017a0 100644
--- a/mindspore/ccsrc/runtime/hardware/ascend/ascend_graph_optimization.h
+++ b/mindspore/ccsrc/runtime/hardware/ascend/ascend_graph_optimization.h
@@ -26,19 +26,14 @@ namespace device {
 namespace ascend {
 class AscendGraphOptimization {
  public:
-  static AscendGraphOptimization &GetInstance() {
-    static AscendGraphOptimization instance;
-    return instance;
-  }
-
   void OptimizeGraph(const KernelGraphPtr &graph);
   void OptimizeSingleOpGraph(const KernelGraphPtr &graph);
   void SetOperatorInfo(const std::vector<CNodePtr> &nodes);
   void UnifyMindIR(const KernelGraphPtr &graph);
-
- private:
   AscendGraphOptimization() { graph_manager_ = MakeManager(); }
   ~AscendGraphOptimization() = default;
+
+ private:
   AscendGraphOptimization(const AscendGraphOptimization &) = delete;
   AscendGraphOptimization &operator=(const AscendGraphOptimization &) = delete;
   // Graph Optimized level-2 interface
@@ -70,6 +65,8 @@ class AscendGraphOptimization {
   // Note: Please clean the set before each use.
   std::set<KernelGraphPtr> memo_;
 };
+
+AscendGraphOptimization GetAscendGraphOptimization();
 }  // namespace ascend
 }  // namespace device
 }  // namespace mindspore