diff --git a/cpp/src/db/scheduler/TaskDispatchStrategy.cpp b/cpp/src/db/scheduler/TaskDispatchStrategy.cpp
index 985f86cb0912684e5b8aab217995502ce7629e9b..73c46942c88daa867ba53ea06ebc15fa4ae5c876 100644
--- a/cpp/src/db/scheduler/TaskDispatchStrategy.cpp
+++ b/cpp/src/db/scheduler/TaskDispatchStrategy.cpp
@@ -32,7 +32,7 @@ public:
 
             IndexLoadTaskPtr loader = std::static_pointer_cast<IndexLoadTask>(task);
             if(index_files.find(loader->file_->id_) != index_files.end()){
-                ENGINE_LOG_INFO << "Append SearchContext to exist IndexLoaderContext";
+                ENGINE_LOG_DEBUG << "Append SearchContext to exist IndexLoaderContext";
                 index_files.erase(loader->file_->id_);
                 loader->search_contexts_.push_back(context);
             }
@@ -40,7 +40,7 @@ public:
 
         //index_files still contains some index files, create new loader
         for(auto& pair : index_files) {
-            ENGINE_LOG_INFO << "Create new IndexLoaderContext for: " << pair.second->location_;
+            ENGINE_LOG_DEBUG << "Create new IndexLoaderContext for: " << pair.second->location_;
             IndexLoadTaskPtr new_loader = std::make_shared<IndexLoadTask>();
             new_loader->search_contexts_.push_back(context);
             new_loader->file_ = pair.second;
diff --git a/cpp/src/db/scheduler/context/SearchContext.cpp b/cpp/src/db/scheduler/context/SearchContext.cpp
index 493005f05a0351279540b8ba0e11342b8545ab7f..599686b5f4a1f2b3f1c2dba97290f4dd806a584c 100644
--- a/cpp/src/db/scheduler/context/SearchContext.cpp
+++ b/cpp/src/db/scheduler/context/SearchContext.cpp
@@ -31,7 +31,7 @@ SearchContext::AddIndexFile(TableFileSchemaPtr& index_file) {
         return false;
     }
 
-    SERVER_LOG_INFO << "SearchContext " << identity_ << " add index file: " << index_file->id_;
+    SERVER_LOG_DEBUG << "SearchContext " << identity_ << " add index file: " << index_file->id_;
 
     map_index_files_[index_file->id_] = index_file;
     return true;
@@ -42,7 +42,7 @@ SearchContext::IndexSearchDone(size_t index_id) {
     std::unique_lock <std::mutex> lock(mtx_);
     map_index_files_.erase(index_id);
     done_cond_.notify_all();
-    SERVER_LOG_INFO << "SearchContext " << identity_ << " finish index file: " << index_id;
+    SERVER_LOG_DEBUG << "SearchContext " << identity_ << " finish index file: " << index_id;
 }
 
 void
diff --git a/cpp/src/db/scheduler/task/IndexLoadTask.cpp b/cpp/src/db/scheduler/task/IndexLoadTask.cpp
index 91f0e26577b4f468345c63aca06fc770e8bd4731..ef7d61ca3379b0ba94ff48d1420f2a0b8939c074 100644
--- a/cpp/src/db/scheduler/task/IndexLoadTask.cpp
+++ b/cpp/src/db/scheduler/task/IndexLoadTask.cpp
@@ -41,7 +41,7 @@ IndexLoadTask::IndexLoadTask()
 }
 
 std::shared_ptr<IScheduleTask> IndexLoadTask::Execute() {
-    ENGINE_LOG_INFO << "Loading index(" << file_->id_ << ") from location: " << file_->location_;
+    ENGINE_LOG_DEBUG << "Loading index(" << file_->id_ << ") from location: " << file_->location_;
 
     server::TimeRecorder rc("Load index");
     //step 1: load index
@@ -53,7 +53,7 @@ std::shared_ptr<IScheduleTask> IndexLoadTask::Execute() {
     rc.Record("load index file to memory");
 
     size_t file_size = index_ptr->PhysicalSize();
-    LOG(DEBUG) << "Index file type " << file_->file_type_ << " Of Size: "
+    ENGINE_LOG_DEBUG << "Index file type " << file_->file_type_ << " Of Size: "
                << file_size/(1024*1024) << " M";
 
     CollectFileMetrics(file_->file_type_, file_size);
diff --git a/cpp/src/db/scheduler/task/SearchTask.cpp b/cpp/src/db/scheduler/task/SearchTask.cpp
index 5606ba2c84221712e648268d53325f96bf3b58ff..d44e43163abf12c2d8ef8856a8ac6338e82a1c8a 100644
--- a/cpp/src/db/scheduler/task/SearchTask.cpp
+++ b/cpp/src/db/scheduler/task/SearchTask.cpp
@@ -51,7 +51,7 @@ std::shared_ptr<IScheduleTask> SearchTask::Execute() {
         return nullptr;
     }
 
-    SERVER_LOG_INFO << "Searching in index(" << index_id_<< ") with "
+    SERVER_LOG_DEBUG << "Searching in index(" << index_id_<< ") with "
                     << search_contexts_.size() << " tasks";
 
     server::TimeRecorder rc("DoSearch index(" + std::to_string(index_id_) + ")");