diff --git a/config.json.example b/config.json.example
index b6bc1d0e..81c552e9 100644
--- a/config.json.example
+++ b/config.json.example
@@ -59,7 +59,10 @@
       "logfile_base_name":"",
       //log_size_limit:100000000 bytes by default,
       //When the log file size reaches "log_size_limit", the log file will be switched.
-      "log_size_limit":100000000
+      "log_size_limit":100000000,
+      //log_level:"DEBUG" by default,options:"TRACE","DEBUG","INFO","WARN"
+      //The TRACE level is only valid when built in DEBUG mode.
+      "log_level":"DEBUG"
     },
     //run_as_daemon:false by default
     "run_as_daemon":false,
diff --git a/examples/simple_example/main.cc b/examples/simple_example/main.cc
index a4719a70..32a180b7 100755
--- a/examples/simple_example/main.cc
+++ b/examples/simple_example/main.cc
@@ -108,7 +108,7 @@ int main()
 //    drogon::HttpAppFramework::instance().addListener("0.0.0.0",4431,true);
 //#endif
     drogon::HttpAppFramework::instance().setThreadNum(4);
-    trantor::Logger::setLogLevel(trantor::Logger::TRACE);
+//    trantor::Logger::setLogLevel(trantor::Logger::TRACE);
     //class function
     drogon::HttpAppFramework::registerHttpApiMethod("/api/v1/handle1/{1}/{2}/?p3={3}&p4={4}",&A::handle);
     drogon::HttpAppFramework::registerHttpApiMethod("/api/v1/handle11/{1}/{2}/?p3={3}&p4={4}",&A::staticHandle);
diff --git a/lib/src/ConfigLoader.cc b/lib/src/ConfigLoader.cc
index 7f7106f2..445c1903 100644
--- a/lib/src/ConfigLoader.cc
+++ b/lib/src/ConfigLoader.cc
@@ -63,6 +63,23 @@ static void loadLogSetting(const Json::Value &log)
         auto logSize=log.get("log_size_limit",100000000).asUInt64();
         HttpAppFramework::instance().setLogPath(logPath,baseName,logSize);
     }
+    auto logLevel=log.get("log_level","DEBUG").asString();
+    if(logLevel=="TRACE")
+    {
+        trantor::Logger::setLogLevel(trantor::Logger::TRACE);
+    }
+    else if(logLevel=="DEBUG")
+    {
+        trantor::Logger::setLogLevel(trantor::Logger::DEBUG);
+    }
+    else if(logLevel=="INFO")
+    {
+        trantor::Logger::setLogLevel(trantor::Logger::INFO);
+    }
+    else if(logLevel=="WARN")
+    {
+        trantor::Logger::setLogLevel(trantor::Logger::WARN);
+    }
 }
 static void loadApp(const Json::Value &app)
 {