代码如下：

TeX

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\documentclass[UTF8]{ctexbook}
\usepackage[titles]{tocloft}
\renewcommand{\cftdot}{$\cdot$}
\renewcommand{\cftdotsep}{1.5}
\setlength{\cftbeforechapskip}{10pt}

\renewcommand{\cftchapleader}{\cftdotfill{\cftchapdotsep}}
\renewcommand{\cftchapdotsep}{\cftdotsep}
\makeatletter
\renewcommand{\numberline}[1]{%
\settowidth\@tempdimb{#1\hspace{0.5em}}%
\ifdim\@tempdima<\@tempdimb%
  \@tempdima=\@tempdimb%
\fi%
\hb@xt@\@tempdima{\@cftbsnum #1\@cftasnum\hfil}\@cftasnumb}
\makeatother

\begin{document}
\contentsline {chapter}{\numberline {第1\ignorespaces 章\hspace {0.3em}}  熟悉\LaTeX{}}{3}
\contentsline {section}{\numberline {1.1}  \TeX{}历史}{3}
\contentsline {section}{\numberline {1.2}  \LaTeX{}历史}{4}
\contentsline {section}{\numberline {1.3}  关于编码}{9}
\contentsline {section}{\numberline {1.4}  中文支持}{13}
\contentsline {section}{\numberline {1.5}  基础知识}{13}
\contentsline {section}{\numberline {} 习题}{13}

\contentsline {chapter}{\numberline {第2\ignorespaces 章\hspace {0.3em}}  文档结构}{15}
\contentsline {section}{\numberline {2.1}  章节知识}{16}
\contentsline {section}{\numberline {2.2}  章节修改}{18}
\contentsline {section}{\numberline {2.3}  计数器}{19}
\contentsline {section}{\numberline {2.4}  中文支持}{23}
\contentsline {section}{\numberline {2.5}  基础知识}{23}
\contentsline {section}{\numberline {} 习题}{23}

\end{document}

若是英文基类，添加如下代码即可：


\usepackage{tocloft}

\renewcommand\cftchapdotsep{\cftdotsep}
\renewcommand\cftchapleader{\cftdotfill{\cftchapdotsep}}

\usepackage{titletoc}  
\titlecontents{chapter}[0pt]{\addvspace{2pt}\filright}
              {\contentspush{\thecontentslabel\ }}
              {}{\titlerule*[8pt]{.}\contentspage}