diff --git a/public/static/pdf/web/viewer.js b/public/static/pdf/web/viewer.js
index b81ad686c..cdcff62fd 100644
--- a/public/static/pdf/web/viewer.js
+++ b/public/static/pdf/web/viewer.js
@@ -686,7 +686,32 @@ const PDFViewerApplication = {
         title = url;
       }
     }
-    this.setTitle(title);
+    // 自定义title - (源码) - 开始(1/3)
+    // this.setTitle(title);
+    // 自定义title - (源码) - 结束(1/3)
+
+    // 自定义title - (修改代码) - 开始(2/3)
+    var fileName = '';
+    var fileUrlId = '';
+    var url = decodeURIComponent(window.location.search);
+    var attIdIndex = url.indexOf('ATT_FILE');
+    if (attIdIndex > -1) {
+      fileUrlId = url.substring(attIdIndex, url.length);
+      if (fileUrlId != null && fileUrlId !== '' && sessionStorage.getItem('fileInfo')) {
+        let fileList = JSON.parse(sessionStorage.getItem('fileInfo'))
+        if (fileList != null && fileList.length > 0) {
+          for (var i = 0; i < fileList.length; i++) {
+            // console.log("huoqu:" + fileList[i].fileId)
+            if (fileList[i].fileId === fileUrlId) {
+              fileName = fileList[i].fileName + '-'
+              break
+            }
+          }
+        }
+      }
+    }
+    this.setTitle(fileName + '在线查看');
+    // 自定义title - (修改代码) - 结束(2/3)
   },
   setTitle(title = this._title) {
     this._title = title;
@@ -1168,11 +1193,13 @@ const PDFViewerApplication = {
         pdfTitle = metadataTitle;
       }
     }
-    if (pdfTitle) {
-      this.setTitle(`${pdfTitle} - ${this._contentDispositionFilename || this._title}`);
-    } else if (this._contentDispositionFilename) {
-      this.setTitle(this._contentDispositionFilename);
-    }
+    // 自定义title - (源码) - 开始(3/3)
+    // if (pdfTitle) {
+    //   this.setTitle(`${pdfTitle} - ${this._contentDispositionFilename || this._title}`);
+    // } else if (this._contentDispositionFilename) {
+    //   this.setTitle(this._contentDispositionFilename);
+    // }
+    // 自定义title - (源码) - 结束(3/3)
     if (info.IsXFAPresent && !info.IsAcroFormPresent && !pdfDocument.isPureXfa) {
       if (pdfDocument.loadingParams.enableXfa) {
         console.warn("Warning: XFA Foreground documents are not supported");