diff --git a/body/chapter01.tex b/body/chapter01.tex
index b530f58..881f9a5 100644
--- a/body/chapter01.tex
+++ b/body/chapter01.tex
@@ -1,7 +1,7 @@
 % !TEX root = ../main.tex
 
 % 中英标题：\chapter{中文标题}[英文标题]
-\chapter{绪~~~~论}[Introduction]
+\chapter{绪\hspace{1em}论}[Introduction]
 % 绪论也需像摘要、目录格式那样空出两个半角字符。
 
 \section{课题背景及研究的目的和意义}[Background, objective and significance of the subject]