diff --git a/models/user.go b/models/user.go
index d57dffc..39135c1 100644
--- a/models/user.go
+++ b/models/user.go
@@ -14,7 +14,17 @@ type User struct {
 	ActiveAt time.Time
 	Coin     int
 }
-
+func AdddCoin(uid int , num int) int {
+	var u User
+	if db.Where("number = ?", uid).First(&u).Error != nil {
+		return 0
+	}
+	db.Model(u).Updates(map[string]interface{}{
+		"coin": gorm.Expr(fmt.Sprintf("coin+%d",num)),
+	})
+	u.Coin+=num
+	return u.Coin
+}
 func AddCoin(uid int) int {
 	var u User
 	if db.Where("number = ?", uid).First(&u).Error != nil {