diff --git a/uuid.go b/uuid.go
index 0cbd317..38ff2da 100644
--- a/uuid.go
+++ b/uuid.go
@@ -4,6 +4,7 @@ import (
 	"crypto/rand"
 	"encoding/hex"
 	"fmt"
+	"time"
 )
 
 // Simple call
@@ -69,3 +70,13 @@ func ParseUUID(uuid string) ([]byte, error) {
 
 	return ret, nil
 }
+
+// 根据用户id获取订单号 标准时间毫秒级+user_id
+func CreateOrderSn(user_id string) string {
+	if user_id == "" {
+		user_id = GetRandomNumber(5)
+	}
+	t := time.Now()
+	order_sn := fmt.Sprintf("%s%03d%s", t.Format("20060102150405"), t.Nanosecond()/1e6, user_id)
+	return order_sn
+}