diff --git a/paddle/fluid/framework/executor.h b/paddle/fluid/framework/executor.h
index 214ca3dc492c31d4c683790a6ae051be467401c9..f95808c199b9de693ec653c29374c9130be7fd59 100644
--- a/paddle/fluid/framework/executor.h
+++ b/paddle/fluid/framework/executor.h
@@ -60,6 +60,7 @@ class Executor {
   void Run(const ProgramDesc& prog, Scope* scope, int block_id,
            bool create_local_scope = true, bool create_vars = true);
 
+  // This API is very slow.
   void Run(const ProgramDesc& program, Scope* scope,
            std::map<std::string, const LoDTensor*>* feed_targets,
            std::map<std::string, LoDTensor*>* fetch_targets,
@@ -79,6 +80,7 @@ class Executor {
                           bool create_local_scope = true,
                           bool create_vars = true, bool keep_kids = false);
 
+  // This API is very slow.
   void RunPreparedContext(ExecutorPrepareContext* ctx, Scope* scope,
                           std::map<std::string, const LoDTensor*>* feed_targets,
                           std::map<std::string, LoDTensor*>* fetch_targets,
diff --git a/paddle/fluid/inference/api/analysis_predictor.cc b/paddle/fluid/inference/api/analysis_predictor.cc
index 0b29b233822330e3c1441793ce036b9b9278721b..7cdaf4c6a232f2cdfdd4fa27797de632bbe9c560 100644
--- a/paddle/fluid/inference/api/analysis_predictor.cc
+++ b/paddle/fluid/inference/api/analysis_predictor.cc
@@ -80,8 +80,7 @@ class AnalysisPredictor : public NativePaddlePredictor {
                                sub_scope_ ? sub_scope_ : scope_.get(), 0);
 
     // Get the feed_target_names and fetch_target_names
-    feed_target_names_ = inference_program_->GetFeedTargetNames();
-    fetch_target_names_ = inference_program_->GetFetchTargetNames();
+    PrepareFeedFetch();
     return true;
   }