diff --git a/src/common/model/preference/model/PreviewEngine.ts b/src/common/model/preference/model/PreviewEngine.ts
index bde3771..85a7b50 100644
--- a/src/common/model/preference/model/PreviewEngine.ts
+++ b/src/common/model/preference/model/PreviewEngine.ts
@@ -10,6 +10,7 @@ export default class PreviewEngine extends Base {
    * 此预览引擎的url
    * {originUrl} 文件原始的url地址。eg: https://tank.eyeblue.cn/api/alien/download/2a0ceee1-744c-4c82-4215-69c382597a50/abstract-free-photo-2210x1473.jpg
    * {url} 对于公有文件publicUrl=originUrl，对于私有文件publicUrl是originUrl带上downloadToken。 eg: https://tank.eyeblue.cn/api/alien/download/2a0ceee1-744c-4c82-4215-69c382597a50/abstract-free-photo-2210x1473.jpg?downloadTokenUuid=6bdba52f-af6b-49ae-5a5d-fd80bfb01d3b
+   * {b64Url} 文件原始地址
    */
   url: string = "";
 
diff --git a/src/pages/widget/previewer/PreviewerHelper.ts b/src/pages/widget/previewer/PreviewerHelper.ts
index 60aeb7a..b4db211 100644
--- a/src/pages/widget/previewer/PreviewerHelper.ts
+++ b/src/pages/widget/previewer/PreviewerHelper.ts
@@ -11,6 +11,26 @@ import DownloadToken from "../../../common/model/download/token/DownloadToken";
  * 文件预览帮助器
  */
 export default class PreviewerHelper {
+
+  static b64EncodeUnicode(str: string) {
+    // first we use encodeURIComponent to get percent-encoded UTF-8,
+    // then we convert the percent encodings into raw bytes which
+    // can be fed into btoa.
+    return btoa(encodeURIComponent(str).replace(/%([0-9A-F]{2})/g,
+      // function toSolidBytes(match, p1) {
+      (match, p1) => {
+        // console.debug('match: ' + match);
+        return String.fromCharCode(("0x" + p1) as any);
+      }));
+  }
+
+  static b64DecodeUnicode(str: string) {
+    // Going backwards: from bytestream, to percent-encoding, to original string.
+    return decodeURIComponent(atob(str).split('').map(function (c) {
+      return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
+    }).join(''));
+  }
+
   /**
    * 准备好一个文件url
    */
@@ -76,8 +96,9 @@ export default class PreviewerHelper {
 
       const engine: PreviewEngine = previewEngine;
 
-      if(previewUrl) {
+      if (previewUrl) {
         targetUrl = targetUrl.replace("{originUrl}", previewUrl);
+        targetUrl = targetUrl.replace("{b64Url}", previewUrl);
         targetUrl = targetUrl.replace("{url}", previewUrl);
         if (engine.previewInSite) {
           BrowserPreviewer.show(fileName, targetUrl, matter.size);
@@ -85,12 +106,12 @@ export default class PreviewerHelper {
           window.open(targetUrl);
         }
       } else {
-        const needToken = matter.privacy && targetUrl.indexOf("{url}") !== -1;
+        const needToken = matter.privacy && (targetUrl.indexOf("{url}") !== -1||targetUrl.indexOf("{b64Url}") !== -1)
 
         PreviewerHelper.prepareMatterUrl(matter, needToken, function (url) {
           targetUrl = targetUrl.replace("{originUrl}", matter.getPreviewUrl());
+          targetUrl = targetUrl.replace("{b64Url}", encodeURIComponent(PreviewerHelper.b64EncodeUnicode(url)));
           targetUrl = targetUrl.replace("{url}", encodeURIComponent(url));
-
           if (engine.previewInSite) {
             BrowserPreviewer.show(fileName, targetUrl, matter.size);
           } else {