diff --git a/ge/engine_manager/dnnengine_manager.cc b/ge/engine_manager/dnnengine_manager.cc
index b23993b6..777d2b38 100644
--- a/ge/engine_manager/dnnengine_manager.cc
+++ b/ge/engine_manager/dnnengine_manager.cc
@@ -158,7 +158,7 @@ std::shared_ptr<ge::DNNEngine> DNNEngineManager::GetEngine(const std::string &na
   return nullptr;
 }
 
-bool DNNEngineManager::IsEngineRegistered(const std::string &name) {
+bool DNNEngineManager::IsEngineRegistered(const std::string &name) const {
   auto iter = engines_map_.find(name);
   if (iter != engines_map_.end()) {
     return true;
@@ -177,7 +177,7 @@ const map<string, uint64_t> &DNNEngineManager::GetCheckSupportCost() const {
   return checksupport_cost_;
 }
 
-std::string DNNEngineManager::GetDNNEngineName(const ge::NodePtr &node_ptr) {
+std::string DNNEngineManager::GetDNNEngineName(const ge::NodePtr &node_ptr) const {
   std::lock_guard<std::mutex> lock(mutex_);
 
   GE_IF_BOOL_EXEC(node_ptr == nullptr, GELOGE(GE_CLI_GE_NOT_INITIALIZED, "DNNEngineManager: node_ptr is nullptr");
diff --git a/ge/engine_manager/dnnengine_manager.h b/ge/engine_manager/dnnengine_manager.h
index c3ae5b95..4cc0b8cf 100755
--- a/ge/engine_manager/dnnengine_manager.h
+++ b/ge/engine_manager/dnnengine_manager.h
@@ -61,9 +61,9 @@ class DNNEngineManager {
  public:
   friend class GELib;
   std::shared_ptr<ge::DNNEngine> GetEngine(const std::string &name) const;
-  bool IsEngineRegistered(const std::string &name);
+  bool IsEngineRegistered(const std::string &name) const;
   // If can't find appropriate engine name, return "", report error
-  string GetDNNEngineName(const ge::NodePtr &node_ptr);
+  string GetDNNEngineName(const ge::NodePtr &node_ptr) const;
   const map<string, SchedulerConf> &GetSchedulers() const;
   const map<string, uint64_t> &GetCheckSupportCost() const;
   void InitPerformanceStaistic();
diff --git a/ge/init/gelib.h b/ge/init/gelib.h
index e52b8dd6..a2aca99d 100644
--- a/ge/init/gelib.h
+++ b/ge/init/gelib.h
@@ -48,13 +48,13 @@ class GELib {
   Status Finalize();
 
   // get DNNEngineManager object
-  DNNEngineManager &DNNEngineManagerObj() { return engineManager_; }
+  const DNNEngineManager &DNNEngineManagerObj() { return engineManager_; }
 
   // get OpsKernelManager object
-  OpsKernelManager &OpsKernelManagerObj() { return opsManager_; }
+  const OpsKernelManager &OpsKernelManagerObj() { return opsManager_; }
 
   // get SessionManager object
-  SessionManager &SessionManagerObj() { return sessionManager_; }
+  const SessionManager &SessionManagerObj() { return sessionManager_; }
 
   // get Initial flag
   bool InitFlag() const { return init_flag_; }