diff --git a/app/common/service/OssService.php b/app/common/service/OssService.php
index ba4c9e1..ea946ae 100644
--- a/app/common/service/OssService.php
+++ b/app/common/service/OssService.php
@@ -53,7 +53,7 @@ class OssService
      * @param string $objectKey
      * @return string
      */
-    public function generatePrivateUrl($objectKey, $expireTime = 3600)
+    public function generatePrivateUrl($objectKey, $expireTime = 10800)
     {
         // 生成 OSS 私有 URL（有效期为 3600 秒）
         $originalUrl = $this->ossClient->signUrl($this->bucket, $objectKey, $expireTime);