diff --git a/iothub/client/mqttclient/rpc.go b/iothub/client/mqttclient/rpc.go
index 000a8f3..a15c8bd 100644
--- a/iothub/client/mqttclient/rpc.go
+++ b/iothub/client/mqttclient/rpc.go
@@ -37,7 +37,7 @@ func (rpc RpcRequest) Pub(deviceId, reqPayload string) error {
 	topic := fmt.Sprintf(RpcRespTopic, rpc.RequestId)
 	value, ok := Session.Load(deviceId)
 	if !ok {
-		return errors.New("为获取到设备的MQTT连接")
+		return errors.New("未获取到设备的MQTT连接")
 	}
 	return Publish(topic, value.(string), reqPayload)
 }
diff --git a/iothub/client/tcpclient/tcp.go b/iothub/client/tcpclient/tcp.go
index 3a82420..6bc57ed 100644
--- a/iothub/client/tcpclient/tcp.go
+++ b/iothub/client/tcpclient/tcp.go
@@ -20,7 +20,7 @@ func Send(deviceId, msg string) error {
 		}
 	} else {
 		global.Log.Infof("设备%s TCP连接不存在, 发送指令失败", deviceId)
-		return errors.New("为获取到设备的MQTT连接")
+		return errors.New("未获取到设备的MQTT连接")
 	}
 	return nil
 }