diff --git a/services/reward/operator.go b/services/reward/operator.go
index c9f00b1bf..b66810c70 100644
--- a/services/reward/operator.go
+++ b/services/reward/operator.go
@@ -276,22 +276,5 @@ func generateOperateSerialNo(operateType models.RewardOperateType, rewardType mo
 
 		return "", err
 	}
-
-	switch operateType {
-	case models.OperateTypeIncrease:
-		s += "1"
-	case models.OperateTypeDecrease:
-		s += "2"
-	default:
-		s += "9"
-	}
-
-	switch rewardType {
-	case models.RewardTypePoint:
-		s += "1"
-	default:
-		s += "9"
-	}
-
 	return s, nil
 }
diff --git a/services/reward/serial.go b/services/reward/serial.go
index b6a47bbc3..349da1266 100644
--- a/services/reward/serial.go
+++ b/services/reward/serial.go
@@ -11,13 +11,14 @@ import (
 
 func GetSerialNoByRedis() (string, error) {
 	now := time.Now()
-	n, err := redis_client.IncrBy(redis_key.RewardSerialCounter(now), 1)
+	r := int64(rand.Intn(4)) + 1
+	n, err := redis_client.IncrBy(redis_key.RewardSerialCounter(now), r)
 	if err != nil {
 		log.Error("GetSerialNoByRedis RewardSerialCounter error. %v", err)
 		return "", err
 	}
-	if n == 1 {
-		redis_client.Expire(redis_key.RewardSerialCounter(now), 5*time.Minute)
+	if n == r {
+		redis_client.Expire(redis_key.RewardSerialCounter(now), 2*time.Minute)
 	}
-	return now.Format("200601021504") + fmt.Sprint(rand.Intn(10)) + fmt.Sprintf("%02d", n), nil
+	return now.Format("200601021504") + fmt.Sprintf("%03d", n) + fmt.Sprint(rand.Intn(10)), nil
 }