diff --git a/src/utils/kkFilePreview.js b/src/utils/kkFilePreview.js
index ff76aff7..38eec74b 100644
--- a/src/utils/kkFilePreview.js
+++ b/src/utils/kkFilePreview.js
@@ -28,10 +28,6 @@ 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}`
 }
 
diff --git a/src/utils/previewPdf.js b/src/utils/previewPdf.js
index 68342cd4..8a923440 100644
--- a/src/utils/previewPdf.js
+++ b/src/utils/previewPdf.js
@@ -5,10 +5,7 @@ const getToken = () => Vue.ls.get(ACCESS_TOKEN)
 
 // 预览pdf
 const previewPdf = (id) => {
-  const uidGenerator = () => {
-    return '-' + parseInt(Math.random() * 10000 + 1, 10)
-  }
-  const url = `${window._CONFIG.domianURL}/sys/common/view/${id}?type=view&at=${getToken()}&serial=${uidGenerator()}`
+  const url = `${window._CONFIG.domianURL}/sys/common/view/${id}?type=view&at=${getToken()}`
   return `${process.env.BASE_URL}pdfjs/web/viewer.html?file=` + encodeURIComponent(url) + '&.pdf'
 }