diff --git a/platformapi/mtwmapi/callback.go b/platformapi/mtwmapi/callback.go
index 861bddff..0449bc90 100644
--- a/platformapi/mtwmapi/callback.go
+++ b/platformapi/mtwmapi/callback.go
@@ -5,6 +5,7 @@ import (
 	"net/url"
 	"strings"
 
+	"git.rosy.net.cn/baseapi"
 	"git.rosy.net.cn/baseapi/utils"
 )
 
@@ -51,19 +52,23 @@ func Err2CallbackResponse(err error, data string) *CallbackResponse {
 
 func (a *API) GetCallbackMsg(request *http.Request) (msg *CallbackMsg, callbackResponse *CallbackResponse) {
 	data := utils.URLValues2Map(request.PostForm)
-	fullURL := strings.TrimRight(a.callbackURL+request.URL.Path, "/")
-	sign := a.signParams(fullURL+"?", data)
-	if sign != data[signKey] {
-		return nil, SignatureIsNotOk
+	if dataSign, ok := data[signKey]; ok {
+		fullURL := strings.TrimRight(a.callbackURL+request.URL.Path, "/")
+		sign := a.signParams(fullURL+"?", data)
+		if sign != dataSign.(string) {
+			baseapi.SugarLogger.Debugf("mtwm GetCallbackMsg my sign:%v, data sign:%v", sign, dataSign.(string))
+			return nil, SignatureIsNotOk
+		}
+		cmd := strings.Trim(request.URL.EscapedPath(), "/")
+		cmd = cmd[strings.LastIndex(cmd, "/")+1:]
+		msg = &CallbackMsg{
+			Cmd: cmd,
+		}
+		msg.Data = make(url.Values)
+		for k, v := range data {
+			msg.Data.Set(k, v.(string))
+		}
+		return msg, nil
 	}
-	cmd := strings.Trim(request.URL.EscapedPath(), "/")
-	cmd = cmd[strings.LastIndex(cmd, "/")+1:]
-	msg = &CallbackMsg{
-		Cmd: cmd,
-	}
-	msg.Data = make(url.Values)
-	for k, v := range data {
-		msg.Data.Set(k, v.(string))
-	}
-	return msg, nil
+	return nil, SuccessResponse
 }
diff --git a/utils/typeconv.go b/utils/typeconv.go
index 663759ab..4a65bb79 100644
--- a/utils/typeconv.go
+++ b/utils/typeconv.go
@@ -106,7 +106,7 @@ func MustInterface2Float64(data interface{}) float64 {
 }
 
 func Interface2FloatWithDefault(data interface{}, defValue float64) (retVal float64) {
-	if data == nil {
+	if _, ok := data.(json.Number); !ok {
 		return defValue
 	}
 	return MustInterface2Float64(data)