diff --git a/object/user.go b/object/user.go
index ca375fb4..3b1ef322 100644
--- a/object/user.go
+++ b/object/user.go
@@ -35,14 +35,14 @@ type User struct {
 	DisplayName       string   `xorm:"varchar(100)" json:"displayName"`
 	Avatar            string   `xorm:"varchar(500)" json:"avatar"`
 	PermanentAvatar   string   `xorm:"varchar(500)" json:"permanentAvatar"`
-	Email             string   `xorm:"varchar(100)" json:"email"`
-	Phone             string   `xorm:"varchar(100)" json:"phone"`
+	Email             string   `xorm:"varchar(100) index" json:"email"`
+	Phone             string   `xorm:"varchar(100) index" json:"phone"`
 	Location          string   `xorm:"varchar(100)" json:"location"`
 	Address           []string `json:"address"`
 	Affiliation       string   `xorm:"varchar(100)" json:"affiliation"`
 	Title             string   `xorm:"varchar(100)" json:"title"`
 	IdCardType        string   `xorm:"varchar(100)" json:"idCardType"`
-	IdCard            string   `xorm:"varchar(100)" json:"idCard"`
+	IdCard            string   `xorm:"varchar(100) index" json:"idCard"`
 	Homepage          string   `xorm:"varchar(100)" json:"homepage"`
 	Bio               string   `xorm:"varchar(100)" json:"bio"`
 	Tag               string   `xorm:"varchar(100)" json:"tag"`
diff --git a/object/user_util.go b/object/user_util.go
index 482ba652..cd0612bc 100644
--- a/object/user_util.go
+++ b/object/user_util.go
@@ -64,6 +64,12 @@ func GetUserByFields(organization string, field string) *User {
 		return user
 	}
 
+	// check ID card
+	user = GetUserByField(organization, "idCard", field)
+	if user != nil {
+		return user
+	}
+
 	return nil
 }