diff --git a/iothub/client/mqttclient/mqtt_api.go b/iothub/client/mqttclient/mqtt_api.go
index 3c00d36..c763cdb 100644
--- a/iothub/client/mqttclient/mqtt_api.go
+++ b/iothub/client/mqttclient/mqtt_api.go
@@ -11,25 +11,37 @@ import (
 	"sync"
 )
 
-// key 设备id，value MQTT的clientID
-var MqttClient sync.Map
+type MqttClient struct {
+	sync.Map
+}
 
-const ClientsInfo string = "client"
-const SubscribeTopicsInfo string = "subscribe"
+type MqttConfig struct {
+	HttpBroker string
+	Username   string
+	Password   string
+	Qos        int
+}
+
+const (
+	ClientsInfo         = "client"
+	SubscribeTopicsInfo = "subscribe"
+)
+
+var Session MqttClient
 
-// GetEmqInfo 获取emqx信息，包括连接信息，订阅信息
 func GetEmqInfo(infoType string) ([]map[string]interface{}, error) {
 	var url string
-	if infoType == ClientsInfo {
+	switch infoType {
+	case ClientsInfo:
 		url = fmt.Sprintf("%s/v5/clients?_page=1&_limit=100000", global.Conf.Mqtt.HttpBroker)
-	} else if infoType == SubscribeTopicsInfo {
+	case SubscribeTopicsInfo:
 		url = fmt.Sprintf("%s/v5/subscriptions?_page=1&_limit=100000", global.Conf.Mqtt.HttpBroker)
-	} else {
+	default:
 		return nil, errors.New("invalid infoType")
 	}
 
 	req, err := http.NewRequest(http.MethodGet, url, nil)
-	if nil != err {
+	if err != nil {
 		return nil, err
 	}
 	req.SetBasicAuth(global.Conf.Mqtt.Username, global.Conf.Mqtt.Password)
@@ -38,31 +50,29 @@ func GetEmqInfo(infoType string) ([]map[string]interface{}, error) {
 	if err != nil {
 		return nil, err
 	}
-
 	defer resp.Body.Close()
+
 	body, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return nil, err
 	}
 	global.Log.Debug("receive resp, ", string(body))
-	if resp.StatusCode != 200 {
+	if resp.StatusCode != http.StatusOK {
 		return nil, errors.New(resp.Status)
 	}
 
-	var result interface{}
-	if err = json.Unmarshal(body, &result); nil != err {
+	var result map[string]interface{}
+	if err := json.Unmarshal(body, &result); err != nil {
 		global.Log.Error("body Unmarshal error", err)
 		return nil, err
 	}
-	res, ok := result.(map[string]interface{})
+	data, ok := result["data"].([]map[string]interface{})
 	if !ok {
 		return nil, errors.New("result error")
 	}
-	data := res["data"].([]map[string]interface{})
 	return data, nil
 }
 
-// Publish 推送信息
 func Publish(topic, clientId string, payload interface{}) error {
 	if clientId == "" {
 		return errors.New("未获取到MQTT连接")
@@ -77,12 +87,12 @@ func Publish(topic, clientId string, payload interface{}) error {
 		"clientid": clientId,
 	}
 	data, err := json.Marshal(pubData)
-	if nil != err {
+	if err != nil {
 		global.Log.Error("error ", err)
 		return err
 	}
 	req, err := http.NewRequest(http.MethodPost, url, bytes.NewBuffer(data))
-	if nil != err {
+	if err != nil {
 		return err
 	}
 	req.SetBasicAuth(global.Conf.Mqtt.Username, global.Conf.Mqtt.Password)
@@ -94,13 +104,14 @@ func Publish(topic, clientId string, payload interface{}) error {
 		return err
 	}
 	defer resp.Body.Close()
+
 	body, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		global.Log.Error("error ReadAll", err)
 		return err
 	}
 	global.Log.Debug("receive resp, ", string(body))
-	if resp.StatusCode != 200 {
+	if resp.StatusCode != http.StatusOK {
 		global.Log.Error("bad status ", resp.StatusCode)
 		return errors.New(resp.Status)
 	}
diff --git a/iothub/server/emqxserver/hook.go b/iothub/server/emqxserver/hook.go
index 43187b8..6f1fdf4 100644
--- a/iothub/server/emqxserver/hook.go
+++ b/iothub/server/emqxserver/hook.go
@@ -87,7 +87,7 @@ func (s *HookGrpcService) OnClientConnected(ctx context.Context, in *exhook2.Cli
 		return nil, err
 	}
 	//添加连接ID
-	mqttclient.MqttClient.Store(etoken.DeviceId, in.Clientinfo.Clientid)
+	mqttclient.Session.Store(etoken.DeviceId, in.Clientinfo.Clientid)
 	data := netbase.CreateConnectionInfo(message.ConnectMes, "mqtt", in.Clientinfo.Clientid, in.Clientinfo.Peerhost, etoken)
 	go s.HookService.Queue.Queue(data)
 	return &exhook2.EmptySuccess{}, nil
@@ -102,7 +102,7 @@ func (s *HookGrpcService) OnClientDisconnected(ctx context.Context, in *exhook2.
 		return nil, err
 	}
 	//删除连接ID
-	mqttclient.MqttClient.Delete(etoken.DeviceId)
+	mqttclient.Session.Delete(etoken.DeviceId)
 	data := netbase.CreateConnectionInfo(message.DisConnectMes, "mqtt", in.Clientinfo.Clientid, in.Clientinfo.Peerhost, etoken)
 	go s.HookService.Queue.Queue(data)
 	return &exhook2.EmptySuccess{}, nil