diff --git a/mqttclient/mqtt_client.cpp b/mqttclient/mqtt_client.cpp
index 340e384..2dd1018 100644
--- a/mqttclient/mqtt_client.cpp
+++ b/mqttclient/mqtt_client.cpp
@@ -114,7 +114,7 @@ int start_client(const char *boardname, const char *gwid, const char *gwip, cons
         return -1;
     }
 
-    int qos = readIntValue("config", (char*)std::string("qos").c_str(), (char *)GlobalConfig::Config_G.c_str());
+    int qos = readIntValue("config", "qos", (char *)GlobalConfig::Config_G.c_str());
     mosquitto_lib_init(); //使用mosquitto库函数前需进行初始化
     memset(&mqttsdata, 0, sizeof(mqttsdata_t));
     memcpy(mqttsdata.gwid, gwid, strlen(gwid));