diff --git a/njuthesis.dtx b/njuthesis.dtx
index 10ccbf83d06a4445e9240ff03149b9a11ab3dde2..38a8368bb401306c989832f44d6aa6952484ac5c 100644
--- a/njuthesis.dtx
+++ b/njuthesis.dtx
@@ -2263,7 +2263,7 @@ through XeTeX.
   \thispagestyle{empty}
   \pagenumbering{Roman}
   % Start
-  \pdfbookmark{灏侀潰}{灏侀潰} % 灏嗗皝闈㈡彃鍏df涔︾
+  \pdfbookmark{灏侀潰}{cover} % 灏嗗皝闈㈡彃鍏df涔︾
   \begin{spacing}{1.25}
   \vskip 0mm
   \hspace{-10mm}
@@ -2298,7 +2298,7 @@ through XeTeX.
   \thispagestyle{empty}
   \pagenumbering{Roman}
   % Start
-  \pdfbookmark{灏侀潰}{灏侀潰} % 灏嗗皝闈㈡彃鍏df涔︾
+  \pdfbookmark{灏侀潰}{cover} % 灏嗗皝闈㈡彃鍏df涔︾
   \begin{spacing}{1.25}
   \begin{center}
     \hspace{0pt} \vskip 5mm
@@ -2353,7 +2353,7 @@ through XeTeX.
 \cs_new_protected:Npn \@@_print_cover_en:
 {
   \thispagestyle{empty}
-  \pdfbookmark{鑻辨枃灏侀潰}{English~cover} % 灏嗗皝闈㈡彃鍏df涔︾
+  \pdfbookmark{鑻辨枃灏侀潰}{cover-en} % 灏嗗皝闈㈡彃鍏df涔︾
   \begin{center}
     \vspace*{20pt}
     \bf\sffamily\zihao{2}\l_@@_info_title_en_tl