diff --git a/src/common/preview/index.js b/src/common/preview/index.js
index 0fba21c5f..4bbde6786 100644
--- a/src/common/preview/index.js
+++ b/src/common/preview/index.js
@@ -39,7 +39,11 @@ async function preview (attId, type) {
         url = 'book://ssreader/e0?url=' + file.downLoadUrl
       }
     } else if (file.fileSuffix.toLowerCase() === 'pdf') {
-      url = './static/pdf/web/viewer.html?file=' + encodeURIComponent('/api/att/attFile/getFileInfo?fileId=' + file.id)
+      let viewer = '/static/pdf/web/viewer.html?file='
+      if (isMobile()) {
+        viewer = '/static/pdf_old/web/viewer.html?file='
+      }
+      url = viewer + encodeURIComponent('/api/att/attFile/getFileInfo?fileId=' + file.id)
     } else {
       // onlyoffice在线编辑文件转换为pdf预览 -> kkfileview预览乱码
       if (file.onlined && file.onlined === 1) {