diff --git a/lite/api/cxx_api.h b/lite/api/cxx_api.h
index 67f9a9d1d84b88f93db560ce1a6903b711ad492f..76967fa0084ada18d1161457e4eacb90e7319db6 100644
--- a/lite/api/cxx_api.h
+++ b/lite/api/cxx_api.h
@@ -81,16 +81,16 @@ class LITE_API Predictor {
              const std::vector<std::string>& passes = {});
 
   std::shared_ptr<Predictor> Clone(
-      cosnst std::vector<std::string> var_names) const {
+      const std::vector<std::string>& var_names) const {
     //    CHECK(program_desc_) << "Both program and scope of current predicotr
     //    should  be not be nullptr in Clone mode." ;
     //    CHECK(scope_) << "Both program and scope of current predicotr should
     //    be not be nullptr in Clone mode.";
     for (auto i : var_names) {
-      exec_scope_->Var(i);
-      auto* tensor = scope_->Var(i)->GetMutable<lite::Tensor>();
-      auto* sub_tensor = exec_scope_->Var(i)->GetMutable<lite::Tensor>();
-      sub_tensor->CopyDataFrom(tensor);
+      this->exec_scope_->Var(i);
+      auto* tensor = this->scope_->Var(i)->GetMutable<lite::Tensor>();
+      auto* sub_tensor = this->exec_scope_->Var(i)->GetMutable<lite::Tensor>();
+      sub_tensor->CopyDataFrom(*tensor);
     }
     auto predictor =
         std::make_shared<Predictor>(program_desc_, scope_, valid_places_);
@@ -150,7 +150,7 @@ class LITE_API Predictor {
   Optimizer optimizer_;
   std::shared_ptr<cpp::ProgramDesc> program_desc_;
   std::shared_ptr<Scope> scope_;
-  const Scope* exec_scope_;
+  Scope* exec_scope_;
   std::unique_ptr<RuntimeProgram> program_;
   bool program_generated_{false};
   std::vector<std::string> input_names_;
@@ -173,7 +173,8 @@ class CxxPaddleApiImpl : public lite_api::PaddlePredictor {
 
   void Run() override;
 
-  std::shared_ptr<lite_api::PaddlePredictor> Clone() override;
+  std::shared_ptr<lite_api::PaddlePredictor> Clone(
+      const std::vector<std::string>& var_names);
 
   std::string GetVersion() const override;
 
diff --git a/lite/api/cxx_api_impl.cc b/lite/api/cxx_api_impl.cc
index 5faddd69d0bd2bbbe0efe8b341c92403601081c3..e50e4a4032588379412daefcb92c95dbea1b7ce3 100644
--- a/lite/api/cxx_api_impl.cc
+++ b/lite/api/cxx_api_impl.cc
@@ -120,7 +120,7 @@ void CxxPaddleApiImpl::Run() {
 }
 
 std::shared_ptr<lite_api::PaddlePredictor> CxxPaddleApiImpl::Clone(
-    cosnst std::vector<std::string> var_names) {
+    const std::vector<std::string> &var_names) {
   std::lock_guard<std::mutex> lock(mutex_);
   auto predictor = std::make_shared<lite::CxxPaddleApiImpl>(
       raw_predictor_->Clone(var_names));
diff --git a/lite/api/light_api.h b/lite/api/light_api.h
index aa25ea81c7b62238211f96265a4edc49f2d065a1..279565cc718b697309bec6ff66214420cdbf955b 100644
--- a/lite/api/light_api.h
+++ b/lite/api/light_api.h
@@ -113,7 +113,8 @@ class LightPredictorImpl : public lite_api::PaddlePredictor {
 
   void Run() override;
 
-  std::shared_ptr<lite_api::PaddlePredictor> Clone() override;
+  std::shared_ptr<lite_api::PaddlePredictor> Clone(
+      const std::vector<std::string>& var_names);
 
   std::string GetVersion() const override;
   std::vector<std::string> GetInputNames() override;
diff --git a/lite/api/light_api_impl.cc b/lite/api/light_api_impl.cc
index cdf5b7fb06df35b2e7fb72fc4e33ccb721a0f7f7..661dbccb52d8e99c3581e376a6795282ad635a8f 100644
--- a/lite/api/light_api_impl.cc
+++ b/lite/api/light_api_impl.cc
@@ -56,7 +56,8 @@ void LightPredictorImpl::Run() {
   raw_predictor_->Run();
 }
 
-std::shared_ptr<lite_api::PaddlePredictor> LightPredictorImpl::Clone() {
+std::shared_ptr<lite_api::PaddlePredictor> LightPredictorImpl::Clone(
+    const std::vector<std::string>& var_names) {
   LOG(FATAL) << "The Clone API is not supported in LigthPredictor";
   return nullptr;
 }
diff --git a/lite/api/paddle_api.h b/lite/api/paddle_api.h
index b08f2f5c745f87cda2be181bdea2444b2c11313c..caa584601a417db4ac5d42ebb6c317ceebca5608 100644
--- a/lite/api/paddle_api.h
+++ b/lite/api/paddle_api.h
@@ -78,7 +78,8 @@ class LITE_API PaddlePredictor {
   virtual std::unique_ptr<const Tensor> GetOutput(int i) const = 0;
 
   virtual void Run() = 0;
-  virtual std::shared_ptr<PaddlePredictor> Clone() = 0;
+  virtual std::shared_ptr<PaddlePredictor> Clone(
+      const std::vector<std::string>& var_names) = 0;
 
   virtual std::string GetVersion() const = 0;