diff --git a/business/model/dao/dao.go b/business/model/dao/dao.go
index 45b709866..610153e7b 100644
--- a/business/model/dao/dao.go
+++ b/business/model/dao/dao.go
@@ -14,7 +14,8 @@ const (
 )
 
 type DaoDB struct {
-	db orm.Ormer
+	transactionLevel int
+	db               orm.Ormer
 }
 
 // func GetRows(db *gorm.DB, inPtr interface{}, sql string, values ...interface{}) (err error) {
@@ -62,16 +63,28 @@ func WrapDB(ormDb orm.Ormer) *DaoDB {
 	return &DaoDB{db: ormDb}
 }
 
-func Begin(db *DaoDB) error {
-	return db.db.Begin()
+func Begin(db *DaoDB) (err error) {
+	if db.transactionLevel == 0 {
+		err = db.db.Begin()
+	}
+	db.transactionLevel++
+	return err
 }
 
-func Commit(db *DaoDB) error {
-	return db.db.Commit()
+func Commit(db *DaoDB) (err error) {
+	if db.transactionLevel <= 1 {
+		err = db.db.Commit()
+		db.transactionLevel = 0
+	} else {
+		db.transactionLevel--
+	}
+	return err
 }
 
-func Rollback(db *DaoDB) error {
-	return db.db.Rollback()
+func Rollback(db *DaoDB) (err error) {
+	err = db.db.Rollback()
+	db.transactionLevel = 0
+	return err
 }
 
 func GetRow(db *DaoDB, inPtr interface{}, sql string, values ...interface{}) (err error) {