diff --git a/backend/internal/modules/order/repository.go b/backend/internal/modules/order/repository.go
index db127a9..c674fc9 100644
--- a/backend/internal/modules/order/repository.go
+++ b/backend/internal/modules/order/repository.go
@@ -2,7 +2,6 @@ package order
 
 import (
 	"crypto/rand"
-	"encoding/hex"
 	"encoding/json"
 	"errors"
 	"log"
@@ -1586,11 +1585,22 @@ func makeAccountSnapshot(account model.GameAccount) (datatypes.JSON, error) {
 }
 
 func newOrderNo() (string, error) {
-	buf := make([]byte, 4)
+	// 生成格式：RO + YYYYMMDDHHMMSS + 3位随机数
+	// 例如：RO20260603123456789
+	now := time.Now()
+
+	// 时间部分：年月日时分秒 (14位)
+	timeStr := now.Format("20060102150405")
+
+	// 随机部分：3位数字 (000-999)
+	buf := make([]byte, 2)
 	if _, err := rand.Read(buf); err != nil {
 		return "", err
 	}
-	return "RO" + strconv.FormatInt(time.Now().UnixNano(), 10) + hex.EncodeToString(buf), nil
+	// 将2字节转为0-999的数字
+	randomNum := (int(buf[0])<<8 | int(buf[1])) % 1000
+
+	return "RO" + timeStr + strconv.Itoa(1000+randomNum)[1:], nil
 }
 
 func appendAuditLog(tx *gorm.DB, actorID uint64, action string, bizType string, bizID uint64, meta AuditMeta, detail map[string]any) error {