diff --git a/business/model/user.go b/business/model/user.go
index ce0d895f9..aa17e4f41 100644
--- a/business/model/user.go
+++ b/business/model/user.go
@@ -57,8 +57,8 @@ type User struct {
 	LastLoginAt   *time.Time `orm:"null" json:"lastLoginAt"`
 	LastLoginIP   string     `orm:"size(64);column(last_login_ip)" json:"lastLoginIP"`
 	LastLoginType string     `orm:"size(16)" json:"lastLoginType"`
-	OpenId        string     `json:"open_id" db:"open_id"`   // 微信用户openId
-	UnionId       string     `json:"union_id" db:"union_id"` // 微信用户Id
+	OpenId        string     `orm:"size(255);column(open_id)" json:"open_id" db:"open_id"`    // 微信用户openId
+	UnionId       string     `orm:"size(255);column(union_id)" json:"union_id" db:"union_id"` // 微信用户Id
 }
 
 func (user *User) TableUnique() [][]string {