diff --git a/ceshi.pdf b/ceshi.pdf
new file mode 100644
index 0000000..76e2143
Binary files /dev/null and b/ceshi.pdf differ
diff --git a/ceshi.tex b/ceshi.tex
new file mode 100644
index 0000000..a5db323
--- /dev/null
+++ b/ceshi.tex
@@ -0,0 +1,28 @@
+\documentclass[cn,11pt,onecol,color=black]{elegantbook}
+% \usepackage{titlesec}
+\usepackage{float}
+\makeatletter
+\@addtoreset{chapter}{part}
+\makeatother
+\renewcommand{\thetable}{\arabic{table}}
+\title{ElegantBook：优美的 \LaTeX{} 书籍模板}
+\subtitle{Elegant\LaTeX{} 经典之作}
+\author{Ethan Deng \& Liam Huang}
+\institute{Elegant\LaTeX{} Program}
+\date{\today}
+\version{3.09}
+\extrainfo{Victory won\rq t come to us unless we go to it. --- M. Moore}
+\logo{logo.png}
+\cover{cover.jpg}
+\begin{document}
+\maketitle
+\tableofcontents
+\mainmatter
+\hypersetup{pageanchor=true}
+\part{1部分}
+\chapter{章1}
+\chapter{章2}
+\part{2部分}
+\chapter{章3}
+\chapter{章1}
+\end{document}
diff --git a/elegantbook-cn.tex b/elegantbook-cn.tex
index 2174472..cdb44d7 100644
--- a/elegantbook-cn.tex
+++ b/elegantbook-cn.tex
@@ -1,4 +1,4 @@
-\documentclass[cn,11pt,twocol]{elegantbook}
+\documentclass[cn,11pt]{elegantbook}
 
 \title{ElegantBook：优美的 \LaTeX{} 书籍模板}
 \subtitle{Elegant\LaTeX{} 经典之作}
@@ -18,7 +18,7 @@
 \maketitle
 
 \tableofcontents
-
+% \thispagestyle{empty}
 
 \mainmatter
 \hypersetup{pageanchor=true}
@@ -431,6 +431,15 @@ The content of introduction.
 	\item exercise 1
 	\item exercise 2
 	\item exercise 3
+	\item 测试数学公式
+\begin{equation}
+a^2+b^2=c^2
+\end{equation}
+\item 测试插图
+\begin{figure}[htp]
+\centering
+\includegraphics[width=0.2\textwidth]{logo.png}
+\end{figure}
 \end{problemset}
 
 \begin{remark}
@@ -513,6 +522,7 @@ LaTeX Error:
 
 
 
+
 \chapter{ElegantBook 写作示例}
 
 \begin{introduction}
@@ -586,6 +596,7 @@ Lebesgue 积分有几种不同的定义方式。我们将采用逐步定义非
    \label{eq:461}
    \int_{\mathcal{R}^p\times\mathcal{R}^q} f(x,y) dxdy=\int_{\mathcal{R}^p}\left(\int_{\mathcal{R}^q}f(x,y)dy\right)dx.
 \end{equation}
+
 （2）若 $f(x,y)$ 是 $\mathcal{R}^p\times\mathcal{R}^q$ 上的可积函数，则对几乎处处的 $x\in\mathcal{R}^p$，$f(x,y)$ 作为 $y$ 的函数是 $\mathcal{R}^q$ 上的可积函数，并且 $g(x)=\int_{\mathcal{R}^q}f(x,y) dy$ 是 $\mathcal{R}^p$ 上的可积函数。而且~\ref{eq:461} 成立。
 \end{theorem}
 
diff --git a/elegantbook.cls b/elegantbook.cls
index 2309087..2ef24bd 100644
--- a/elegantbook.cls
+++ b/elegantbook.cls
@@ -77,8 +77,6 @@
 \LoadClass[a4paper,oneside]{book}
 
 \RequirePackage{indentfirst,comment}
-\setlength\parindent{2em}
-
 % fontsetting
 \ifdefstring{\ELEGANT@math}{mtpro2}{
 \let\Bbbk\relax
@@ -93,7 +91,10 @@
 
 \RequirePackage{ifxetex}
 
-
+% \AtBeginDocument{%
+%   \addtocontents{toc}{\protect\pagestyle{empty}}%
+%   \addtocontents{lof}{\protect\thispagestyle{empty}}%
+% }
 
 \RequirePackage{newtxtext}
 \RequirePackage{anyfontsize}
@@ -254,6 +255,7 @@
 
 %%中文结构名字
 \ifdefstring{\ELEGANT@lang}{cn}{
+	\setlength\parindent{2\ccwd}
 	\renewcommand{\contentsname}{目\hspace{2em}录}
 	\renewcommand{\figurename}{图}
 	\renewcommand{\tablename}{表}
@@ -278,10 +280,11 @@
 	}{\relax}
 }{\relax}
 \ifdefstring{\ELEGANT@lang}{en}{
-\newcommand\figref[1]{\textbf{Figure}~\ref{#1}}
-\newcommand\tabref[1]{\textbf{Table}~\ref{#1}}
-\renewcommand{\chaptername}{Chapter \thechapter}
-\bibliographystyle{aer}
+	\setlength\parindent{2em}
+	\newcommand\figref[1]{\textbf{Figure}~\ref{#1}}
+	\newcommand\tabref[1]{\textbf{Table}~\ref{#1}}
+	\renewcommand{\chaptername}{Chapter \thechapter}
+	\bibliographystyle{aer}
 }{\relax}
 
 \RequirePackage{xpatch}
@@ -357,7 +360,7 @@
 \newcommand\email[1]{\href{mailto:#1}{\nolinkurl{#1}}}
 
 %%   章节设置
-\RequirePackage[center,pagestyles]{titlesec}
+\RequirePackage[center]{titlesec}
 \RequirePackage{apptools}
 \RequirePackage[toc,page]{appendix}
 
@@ -369,8 +372,8 @@
 \titleformat{\section}[hang]{\bfseries}
 {\Large\bfseries{\color{structurecolor}\thesection}\enspace}{1pt}{\color{structurecolor}\Large\bfseries\filright}
 
-\titleformat{\subsection}[hang]{\bfseries}
-{\large\bfseries\color{structurecolor}\thesubsection\enspace}{1pt}{\color{structurecolor}\large\bfseries\filright}
+\titleformat{\subsection}[hang]{\bfseries}{
+  \large\bfseries\color{structurecolor}\thesubsection\enspace}{1pt}{\color{structurecolor}\large\bfseries\filright}
 
 \titleformat{\subsubsection}[hang]{\bfseries}
 {\large\bfseries\color{structurecolor}\thesubsubsection\enspace}{1pt}{\color{structurecolor}\large\bfseries\filright}
@@ -389,11 +392,16 @@
 
 
 \RequirePackage[many]{tcolorbox}
+
+% \newlength{\normalparindent}
+% \setlength{\normalparindent}{\parindent}
+
 \ifdefstring{\ELEGANT@mode}{fancy}{
 \tcbset{
     common/.style={
         fontupper=\ifdefstring{\ELEGANT@lang}{en}{\itshape}{\upshape\kaishu},
         lower separated=false,
+        % before upper={\setlength{\parindent}{\normalparindent}},
         coltitle=white,
         colback=gray!5,
         boxrule=0.5pt,