提问于：
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1956
## 编译环境
操作系统
* [x] Windows 10
* [ ] macOS
* [ ] Linux
`若需勾选，请把[ ]改成[x]`
Tex发行版
* [x ] TexLive 2020
* [ ] MikTeX `版本号`
* [ ] CTeX
`若需勾选，请把[ ]改成[x]`
## 我的问题
TeX capacity exceeded, sorry [input stack size=5000].
\thefigure ->\thefigure
```
%!TEX program = xelatex
\documentclass[12pt]{article}
\usepackage{ctex}
\usepackage{amsmath}
\usepackage{setspace}
\usepackage{fancyhdr}
\usepackage{zhlipsum}%随机文本宏包
\usepackage{booktabs}
\usepackage{lipsum}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{graphicx}
\usepackage{titlesec}
\usepackage{titletoc}
\usepackage[left=2.5cm,right=2.5cm,top=3cm,bottom=2.5cm]{geometry} % 页边距：左2.5，右2.5，上3，下2.5
\newcommand*{\song}{\CJKfamily{zhsong}} % 宋体
\newcommand*{\hei}{\CJKfamily{zhhei}} % 黑体
\newcommand*{\kai}{\CJKfamily{zhkai}} % 楷书
\renewcommand{\baselinestretch}{1.5} % 1.5倍行距
\newcommand{\erhao}{\fontsize{22pt}{33pt}\selectfont}
\newcommand{\sanhao}{\fontsize{16pt}{24pt}\selectfont}
\newcommand{\sihao}{\fontsize{14pt}{21pt}\selectfont}
\newcommand{\xiaosi}{\fontsize{12pt}{18pt}\selectfont}
\newcommand{\wuhao}{\fontsize{10.5pt}{\baselineskip}\selectfont}
\renewcommand{\thetable}{\thesection.\arabic{table}}
\renewcommand{\thefigure}{\thefigure.\arabic{table}}
\captionsetup{font={small,bf}}
\numberwithin{equation}{section}
\setcounter{secnumdepth}{4}
\setcounter{tocdepth}{4}
%\setlength{\parskip}{0.5\baselineskip}
\titleformat{\section}[block]{\sanhao\hei}{\arabic{section}}{1em}{}[]
\titleformat{\subsection}[block]{\sihao\hei}{\arabic{section}.\arabic{subsection}}{1em}{}[]
\titleformat{\subsubsection}[block]{\xiaosi\hei}{\arabic{section}.\arabic{subsection}.\arabic{subsubsection}}{1em}{}[]
\pagestyle{fancy}
\fancyhead[C]{毕业设计(论文)}
\fancyhead[R]{第 \thepage 页}
\fancyhead[L]{}
\fancyfoot[C]{}
\makeatletter % change default title style
\renewcommand*\maketitle{%
\begin{center}% 居中标题
\hei % 默认粗体
{\erhao \@title \par} % LARGE字号
\vskip 1em% %%% 标题下面只有1em的缩进或margin
{\global\let\author\@empty}%
{\global\let\date\@empty}%
\thispagestyle{empty} % 不设置页面样式
\end{center}%
\setcounter{footnote}{0}%
}
\makeatother
%% 以上内容请勿修改
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% 填写标题
\title{这是论文的标题}
\date{}
\author{}
%% 导言区结束
\begin{document}
\begin{figure}[h]
\centering %居中显示
\includegraphics[scale=0.8]{f1.PNG}
\caption{标题}
\end{figure}
\end{document}
```
