diff --git a/lib/local_wechat/api.go b/lib/local_wechat/api.go
index 3d34067..36e0757 100644
--- a/lib/local_wechat/api.go
+++ b/lib/local_wechat/api.go
@@ -179,6 +179,10 @@ func TradePcPay(client *wechat.Client, subject, orderID, amount, notifyUrl, prod
 
 // TradeMiniProgPay is 微信小程序支付 ☑️
 func TradeMiniProgPay(client *wechat.Client, subject, orderID, amount, notifyUrl, openid string) (map[string]string, error) {
+	if len(subject) > 127 {
+		tmpSubject := []rune(subject)
+		subject = string(tmpSubject[0:44])
+	}
 	// 初始化 BodyMap
 	bm := make(gopay.BodyMap)
 	bm.Set("nonce_str", util.GetRandomString(32)).