diff --git a/application/extra/upload.php b/application/extra/upload.php
index 93504bfa..d92c7faf 100644
--- a/application/extra/upload.php
+++ b/application/extra/upload.php
@@ -7,9 +7,9 @@ return [
      */
     'uploadurl' => 'ajax/upload',
     /**
-     * 又拍云或本机的CDN地址
+     * 本机的CDN地址或又拍云http://yourbucketname.b0.upaiyun.com
      */
-    'cdnurl'    => 'http://yourbucketname.b0.upaiyun.com',
+    'cdnurl'    => '',
     /**
      * 上传成功后的通知地址
      */
diff --git a/public/assets/js/backend/general/attachment.js b/public/assets/js/backend/general/attachment.js
index a9ec03c8..b4902f92 100644
--- a/public/assets/js/backend/general/attachment.js
+++ b/public/assets/js/backend/general/attachment.js
@@ -56,7 +56,8 @@ define(['jquery', 'bootstrap', 'backend', 'form', 'table', 'config'], function (
                 thumb: function (value, row, index) {
                     //console.log(row);
                     if (row.mimetype.indexOf("image") > -1) {
-                        if (Config.upload.bucket.replace(/^\s+|\s+$/gm, '').length === 0) {
+                        var reg = /ajax\/upload$/;
+                        if (reg.test(Config.upload.uploadurl)) {
                             return '<a href="' + Config.upload.cdnurl + value + '" target="_blank"><img src="' + Config.upload.cdnurl + value + '" alt="" style="max-height:90px;max-width:120px"></a>';
                         } else {
                             return '<a href="' + Config.upload.cdnurl + value + '" target="_blank"><img src="' + Config.upload.cdnurl + value + '!/fwfh/50x50" alt=""></a>';