diff --git a/elegantbook.cls b/elegantbook.cls
index e22c2e3..047a359 100644
--- a/elegantbook.cls
+++ b/elegantbook.cls
@@ -5,11 +5,11 @@
 %% This work may be distributed and/or modified freely
 %% available at https://ddswhu.me/resource/
 % %
-%% Last Modification 2018-12-31
+%% Last Modification 2018-01-08
 %%%%%%%%%%%%%%%%%%%%%
 % % !Mode:: "TeX:UTF-8"
 \NeedsTeXFormat{LaTeX2e}
-\ProvidesClass{elegantbook}[2018/12/31 v3.02 ElegantBook document class]
+\ProvidesClass{elegantbook}[2018/01/08 v3.03 ElegantBook document class]
 
 \RequirePackage{kvoptions}
 \RequirePackage{etoolbox}
@@ -17,7 +17,7 @@
 \newcommand{\ekv}[1]{\kvsetkeys{ELEGANT}{#1}}
 
 % ----- Colors -----
-\DeclareStringOption[green]{color}[green]
+\DeclareStringOption[green]{color}
 % ----- backward compatibility
 \DeclareVoidOption{green}{\ekv{color = green}}
 \DeclareVoidOption{cyan}{\ekv{color = cyan}}
@@ -116,7 +116,7 @@
 \renewcommand{\listfigurename}{插图目录}
 \renewcommand{\listtablename}{表格目录}
 \renewcommand{\bibname}{参考文献}
-\renewcommand{\appendixname}{附\hspace{2em}录}
+\renewcommand{\appendixname}{附录}
 \renewcommand{\indexname}{索\hspace{2em}引}
 
 % more pretty font
@@ -169,7 +169,8 @@
 
 \hypersetup{
 			breaklinks,
-      unicode,
+     		unicode,
+     		linktoc=all,
 			bookmarksnumbered=true,
 			bookmarksopen=true,
 			pdfsubject=\@author \@title Book,
@@ -197,10 +198,12 @@
 
 %%   章节设置
 \RequirePackage[center,pagestyles]{titlesec}
-\renewcommand{\chaptername}{第 \thechapter\;章}
+\RequirePackage{apptools}
+\RequirePackage[toc,page]{appendix}
 
+\renewcommand{\chaptername}{第 \thechapter\;章}
 \titleformat{\chapter}[\style]{\bfseries}
-{\filcenter\LARGE\enspace\bfseries{\color{main}\chaptername}\enspace}{1pt}{\bfseries\color{main}\LARGE\filcenter}[\filcenter\base]
+{\filcenter\LARGE\enspace\bfseries{\color{main}\IfAppendix{\appendixname}{\chaptername}\enspace}}{1pt}{\bfseries\color{main}\LARGE\filcenter}[\filcenter\base]
 
 
 \titleformat{\section}[hang]{\bfseries}
@@ -352,18 +355,15 @@
 {\Huge \bfseries{\color{main} \the\zhtitle } \the\zhend}\\
 \rule{0.8\textwidth}{2pt}
 \end{center}
-\vskip3ex
-\begin{figure}[htp]
-\centering
-\@logo
-\end{figure}
+\vfill
+\vskip5ex
+\centerline{\@logo}
 \begin{center}
 \begin{minipage}{0.65\textwidth}
 \indent\centering\color{bule}\@myquote
 \end{minipage}
 \end{center}
 \vfill
-\vspace{2cm}
 \begin{flushright}
 \color{second}
 \rule{0.45\textwidth}{1pt}\\
diff --git a/figure/ElegantLaTeX_green.pdf b/figure/ElegantLaTeX_green.pdf
new file mode 100644
index 0000000..3203221
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diff --git a/figure/icon.png b/figure/icon.png
new file mode 100644
index 0000000..f927fee
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diff --git a/figure/logo.pdf b/figure/logo.pdf
deleted file mode 100644
index c49c940..0000000
Binary files a/figure/logo.pdf and /dev/null differ
diff --git a/figure/logo.png b/figure/logo.png
index 4c30412..c5d81c6 100644
Binary files a/figure/logo.png and b/figure/logo.png differ
diff --git a/guide.pdf b/guide.pdf
index d4b281f..1e37a5d 100644
Binary files a/guide.pdf and b/guide.pdf differ
diff --git a/guide.tex b/guide.tex
index 766e243..37fcdaf 100644
--- a/guide.tex
+++ b/guide.tex
@@ -7,9 +7,9 @@
 \zhend{模板}
 \entitle{Elegant\LaTeX{} Book}
 \enend{Template}
-\version{3.02}
+\version{3.03}
 \myquote{Victory won\rq t come to us unless we go to it.}
-\logo{logo.png}
+\logo{ElegantLaTeX_green.pdf}
 \cover{cover.pdf}
 
 %green color
@@ -29,8 +29,6 @@
 \usepackage{lipsum}
 \usepackage{texnames}
 
-
-
 \begin{document}
 \maketitle
 \tableofcontents
@@ -223,6 +221,19 @@ \subsection{积分的定义}
 \bibliographystyle{aer}
 \bibliography{reference}
 
-\addcontentsline{toc}{chapter}{参考文献}
+\appendix
+\chapter{线性代数}
+
+\section{矩阵的分块}
+
+\begin{equation} 
+\begin{vmatrix}
+A_1 & 0\\
+C & A_2
+\end{vmatrix}
+=|A_1|\times |A_2|
+\end{equation}
+
+由矩阵 $A$ 的若干行、若干列的交叉位置元素按照原来顺序排成的矩阵称为 $A$ 的一个\textbf{子矩阵}。
 
 \end{document}