diff --git a/doc_related/preface.tex b/doc_related/preface.tex
index 1aa54df..30acdd0 100644
--- a/doc_related/preface.tex
+++ b/doc_related/preface.tex
@@ -10,7 +10,7 @@
 {\Huge\textbf{山东第二医科大学指南}}\\[10pt]
 （简称：\colored{61}{27}{11}{321指南}）\\[20pt]
 %{\large\textbf{\colored{59}{100}{220}{4.0.1.1}}}\vspace*{-25pt}}
-{\large\colored{255}{0}{0}{4027-Preview}}\vspace*{-25pt}}
+{\large\colored{255}{0}{0}{4028-Preview}}\vspace*{-25pt}}
 \author{%
     LinkChou%
     \thanks{%