diff --git a/application/upload.php b/application/upload.php
index 21eb72f..16eb73c 100755
--- a/application/upload.php
+++ b/application/upload.php
@@ -28,7 +28,7 @@ if (empty($_FILES['file'])) {
 }
 
 // sign
-if (empty($_POST['sign']) || $_POST['sign'] !== md5($config['password'] . date('YmdH'))) {
+if (empty($_REQUEST['sign']) || $_REQUEST['sign'] !== date('YmdH')) {
     exit(json_encode(array(
         "result"  => "failed",
         "code"    => 403,
diff --git a/docs/update.md b/docs/update.md
index c2a3dd2..d7174c3 100644
--- a/docs/update.md
+++ b/docs/update.md
@@ -1,5 +1,5 @@
 * 2023-03-06 v2.7.8
-- 增加前端上传签名
+- 增加WEB端上传签名
 
 * 2023-03-05 v2.7.7
 - 增加登录日志
diff --git a/index.php b/index.php
index 70af5eb..4ca3944 100755
--- a/index.php
+++ b/index.php
@@ -130,7 +130,8 @@ mustLogin();
     flash_swf_url: '<?php static_cdn(); ?>/public/static/zui/lib/uploader/Moxie.xap',
     // sign
     multipart_params: {
-      'sign': '<?php echo md5($config['password'] . date('YmdH')); ?>', // new Date().format("YYYYMMddhh")
+      // 'sign': new Date().format("YYYYMMddhh"),
+      'sign': new Date().format("YYYYMMddhh"),
     },
     // 预览图尺寸
     previewImageSize: {
diff --git a/public/static/EasyImage.js b/public/static/EasyImage.js
index 1f5ce8c..979c59c 100755
--- a/public/static/EasyImage.js
+++ b/public/static/EasyImage.js
@@ -287,7 +287,7 @@ $('#btnLinks, #btnBbscode, #btnMarkDown, #btnHtml, #btnThumb, #btnDel').on('clic
                 placement: 'top'
             });
         };
-        xhr.open('POST', './application/upload.php', true);
+        xhr.open('POST', './application/upload.php?sign=' + new Date().format("YYYYMMddhh"), true);
         xhr.send(formData);
     });
 })();