diff --git a/src/utils/kkFilePreview.js b/src/utils/kkFilePreview.js
index 38eec74b..ff76aff7 100644
--- a/src/utils/kkFilePreview.js
+++ b/src/utils/kkFilePreview.js
@@ -28,6 +28,10 @@ export function dealUrl (fileUrl) {
   const watermarkTxt = `${userInfo.username} ${userInfo.realname} ${time}`
   // 客户环境预览需要加的加密参数
   const watermarkSign = md5(watermarkTxt + 'cnhtc')
+  const uidGenerator = () => {
+    return '-' + parseInt(Math.random() * 10000 + 1, 10)
+  }
+  fileUrl += `&serial=${uidGenerator()}`
   return `${window._CONFIG.onlinePreviewDomainURL}?url=${encodeURIComponent(Base64.encode(fileUrl))}&watermarkTxt=${encodeURIComponent(watermarkTxt)}&watermarkSign=${watermarkSign}`
 }