diff --git a/models/custom_migrations.go b/models/custom_migrations.go
index 65b53f0f4..041c4fb93 100755
--- a/models/custom_migrations.go
+++ b/models/custom_migrations.go
@@ -15,10 +15,15 @@ type CustomMigrationStatic struct {
 	Migrate     func(*xorm.Engine, *xorm.Engine) error
 }
 
-var customMigrations []CustomMigration
+var customMigrations = []CustomMigration{
+	//手机号功能可以不启用，不启用时手机号为空串，为了避免启用时唯一性约束报错，定制唯一性约束（对null和空字符串不做唯一性检查）
+	{"set phone number  unique index", setPhoneNumberUniqueIndex},
+}
 
 var customMigrationsStatic []CustomMigrationStatic
 
+
+
 func MigrateCustom(x *xorm.Engine) {
 
 	for _, m := range customMigrations {
@@ -35,13 +40,20 @@ func MigrateCustomStatic(x *xorm.Engine, static *xorm.Engine) {
 	for _, m := range customMigrationsStatic {
 		log.Info("Migration: %s", m.Description)
 		if err := m.Migrate(x, static); err != nil {
-
 			log.Error("Migration: %v", err)
-
 		}
 	}
 }
 
+func setPhoneNumberUniqueIndex(x *xorm.Engine) error {
+
+	query := "CREATE UNIQUE INDEX IF NOT EXISTS \"UQE_user_phone_number\" ON \"user\"  (phone_number) WHERE phone_number IS NOT NULL and phone_number !='';"
+
+	_, err := x.Exec(query)
+	return err
+}
+
+
 func syncTopicStruct(x *xorm.Engine) error {
 
 	query := "ALTER TABLE topic ALTER COLUMN name TYPE varchar(105);"
diff --git a/models/user.go b/models/user.go
index 9602c6e6e..a423a843b 100755
--- a/models/user.go
+++ b/models/user.go
@@ -185,7 +185,7 @@ type User struct {
 	WechatOpenId   string `xorm:"INDEX"`
 	WechatBindUnix timeutil.TimeStamp
 	//Mobile phone
-	PhoneNumber string `xorm:"UNIQUE"`
+	PhoneNumber string `xorm:"VARCHAR(255)"`
 }
 
 // SearchOrganizationsOptions options to filter organizations