diff --git a/main.tex b/main.tex
index 38b6a78..f236347 100644
--- a/main.tex
+++ b/main.tex
@@ -5,24 +5,31 @@
 
 
 \title{思源黑体 + FiraGO}
+\author{丛宇}
 \date{\today}
 
 \begin{document}
 \maketitle
 
 test math font.
-
-\[
+\(
 G'=(V,E)
-\]
-\textbf{math!!! 粗的!}
-$MATH$
+\)
 
-\section{is this bold $MATH \Z$?}
+测试中文
+
+\textbf{粗中文a}
+
+$\mathbf{Bold Math}$
+
+\section{$Bold \; MATH \Z\R \Q$ in title  $\mathbf{Bold Math \Z \R \Q}$?}
 \section{这是bold $\text{你好abc}\R$?}
 \begin{theorem}[sbada]
     aaa 中文
 \end{theorem}
+\begin{proof}
+    test setminus and qed $A\setminus B$
+\end{proof}
 
 \begin{equation}
 \begin{aligned}
@@ -40,7 +47,11 @@ return ss
 \end{algo}
 \caption{this is a fig 这是图}
 \end{figure}
-\textsc{Sans}
-\texttt{monolM}
+
+\textsc{Small Capital}
+
+\textit{italic}
+
+\texttt{mono}
 
 \end{document}
\ No newline at end of file
diff --git a/myctex.sty b/myctex.sty
index 9b1e7a0..e0538da 100644
--- a/myctex.sty
+++ b/myctex.sty
@@ -1,6 +1,6 @@
 \ProvidesPackage{myctex}
-\usepackage[fontset=none, scheme=plain]{ctex}
-\usepackage{fontspec}
+\RequirePackage[fontset=none, scheme=plain]{ctex}
+\RequirePackage{fontspec}
 
 \newif\ifmyctex@sans
 \myctex@sansfalse % Default is serif
@@ -15,8 +15,9 @@
 \setCJKmainfont{Source Han Sans SC}[BoldFont=*, ItalicFont=*]
 \setCJKsansfont{Source Han Sans SC}
 \setCJKmonofont{Source Han Sans SC}
-\usepackage[fira]{fontsetup}
-\usepackage{FiraMono}
+\RequirePackage[fira]{fontsetup}
+\RequirePackage{FiraMono}
+\setmathfont{Fira Math}[range=\setminus]
 
 \else
 \setCJKmainfont{Source Han Serif SC}[BoldFont=*, ItalicFont=*]
@@ -95,10 +96,10 @@
 % ----------------------------------------------------------------------
 
 \def\etal{\emph{et~al.}}            % and others
-%\def\ie{\emph{i.e.}}           % that is
-\def\ie{\textcolor{red}{that is}}
-%\def\eg{\emph{e.g.}}           % for example
-\def\eg{\textcolor{red}{for example}}
+\def\ie{\emph{i.e.}}           % that is
+% \def\ie{\textcolor{red}{that is}}
+\def\eg{\emph{e.g.}}           % for example
+% \def\eg{\textcolor{red}{for example}}
 
 % -----------------------
 % Common Names
@@ -109,14 +110,14 @@
 % useful shortcuts
 % -----------------------
 
-\def\cost{\cent}
+% \def\cost{\cent}
 
 % ----------------------------------------------------------------------
 %  Simple math stuff
 % ----------------------------------------------------------------------
-\renewcommand{\subset}{\subseteq}
+% \renewcommand{\subset}{\subseteq}
 % ---- SYMBOLS ----
-\let\e\varepsilon               % a ``real'' epsilon — better yet, just use Unicode ε.
+\let\e\epsilon               % a ``real'' epsilon — better yet, just use Unicode ε.
 %
 %  I give up.  These are in the wrong font, but my kludged versions 
 %  LOOK like kludges, especially \Z, \Q, and \C.
@@ -316,9 +317,9 @@
 \newif\ifneedqed
 \global\needqedfalse
 \@ifundefined{square}{\let\square\Box}{}    % grumble latex2e 
-\def\QED{\ensuremath{{\square}}}
+% \def\QED{\ensuremath{{\square}}}
 \def\markatright#1{\leavevmode\unskip\nobreak\quad\hspace*{\fill}{#1}}
-\def\qed{\ifneedqed\markatright{\QED}\global\needqedfalse\else\null\fi}
+\def\qed{\ifneedqed\markatright{\ensuremath{{\square}}}\global\needqedfalse\else\null\fi}
 \newproof{proof}{Proof\global\needqedtrue}[\qed]
 \newproof{sketch}{Proof Sketch\global\needqedtrue}[\qed]