diff --git a/src/plugins/mqtt/src/mqttSystem.c b/src/plugins/mqtt/src/mqttSystem.c
index e9af733d078dd00f968a4fb791d67696cccbfbfb..f123d153d199eaa4f8b3475590004ebd4831b185 100644
--- a/src/plugins/mqtt/src/mqttSystem.c
+++ b/src/plugins/mqtt/src/mqttSystem.c
@@ -122,12 +122,11 @@ void mqttCleanUpSystem() {
 }
 
 void mqtt_PublishCallback(void** unused, struct mqtt_response_publish* published) {
-  mqttPrint("mqtt_PublishCallback");
   /* note that published->topic_name is NOT null-terminated (here we'll change it to a c-string) */
   char* topic_name = (char*)malloc(published->topic_name_size + 1);
   memcpy(topic_name, published->topic_name, published->topic_name_size);
   topic_name[published->topic_name_size] = '\0';
-  mqttPrint("Received publish('%s'): %s", topic_name, (const char*)published->application_message);
+  mqttPrint("received publish('%s'): %s", topic_name, (const char*)published->application_message);
   char _token[128] = {0};
   char _dbname[128] = {0};
   char _tablename[128] = {0};
@@ -166,12 +165,12 @@ void* mqttClientRefresher(void* client) {
     mqtt_sync((struct mqtt_client*)client);
     taosMsleep(100);
   }
-  mqttPrint("Exit  mqttClientRefresher");
+  mqttTrace("quit refresher");
   return NULL;
 }
 
 void mqttCleanup(int status, int sockfd, pthread_t* client_daemon) {
-  mqttPrint("mqttCleanup");
+  mqttPrint("clean up mqtt module");
   if (sockfd != -1) close(sockfd);
   if (client_daemon != NULL) pthread_cancel(*client_daemon);
 }
@@ -197,7 +196,7 @@ void mqttQueryInsertCallback(void* param, TAOS_RES* result, int32_t code) {
 }
 
 void mqttReconnectClient(struct mqtt_client* client, void** reconnect_state_vptr) {
-  mqttPrint("mqttReconnectClient");
+  mqttPrint("reconnect client");
   struct reconnect_state_t* reconnect_state = *((struct reconnect_state_t**)reconnect_state_vptr);
 
   /* Close the clients socket if this isn't the initial reconnect call */
@@ -213,7 +212,7 @@ void mqttReconnectClient(struct mqtt_client* client, void** reconnect_state_vptr
   /* Open a new socket. */
   int sockfd = open_nb_socket(reconnect_state->hostname, reconnect_state->port);
   if (sockfd == -1) {
-    mqttError("Failed to open socket: ");
+    mqttError("failed to open socket: ");
     mqttCleanup(EXIT_FAILURE, sockfd, NULL);
   }