如何在已有的模板上实现图片中的页眉效果？

如何在下面的模板上实现图片中的页眉效果？

%%% LaTeX代码开始
\documentclass[12pt,a4paper,twoside,utf8]{book}
%\documentclass[utf8]{book}
\usepackage{titletoc}
\usepackage{titlesec}
\usepackage{ctexcap}
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\usepackage[]{geometry}
\usepackage{imakeidx}
\usepackage{multicol}
\usepackage{hyperref} %
%\usepackage{amssymb}重复
\usepackage{mathrsfs}
\usepackage{epsfig}
\usepackage{indentfirst,makeidx,amssymb,fancyhdr,epstopdf}
\usepackage{latexsym}
\usepackage{amsfonts}
\usepackage{booktabs}
\usepackage{amsthm}
\usepackage{multirow}
\usepackage{enumerate}
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\usepackage{cite}
\usepackage{latexsym}
\usepackage{amsmath}
\usepackage{fancyhdr}
\usepackage{geometry}
%\usepackage{amssymb}%重复
\usepackage{array}
\usepackage{caption}
\usepackage{graphicx}
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\usepackage{amsthm}
\usepackage{mathrsfs}
\textwidth =15cm \topmargin =-0.5cm \textheight =22.5cm
\oddsidemargin=0.5cm
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\newcommand {\citeu}[1]{$^{\mbox{\protect \scriptsize \cite {#1}}}$}
\begin{document}

\thispagestyle{empty}
\ \\
分类号 \underline{\ \ \ \ xxxxx\ \ \ \ \ \ } \vspace*{0.05cm}\quad \quad\quad\quad\quad\quad \quad \quad\quad\quad\quad\quad\quad \quad\quad 密\ \ \ 级 \underline{\ \ \ \ \ \ 无\ \ \ \ \ \ \ \ \ \ \ \ } \vspace*{0.05cm} \\
学校代号\underline{\ \ \ \ xxxxx \ \ \ } \vspace*{0.05cm}\quad \quad\quad\quad\quad\quad  \quad \quad\quad\quad\quad\quad\quad \quad\  学\ \ \ 号 \underline{\  \ 202250000000\ \ } \vspace*{0.05cm} \\
\vspace*{0.2cm}
\begin{center}
    {\heiti\kaishu\zihao{1}\ziju{0.8}xxxx大学}\vspace*{0.8cm}\\
    {\heiti\songti\zihao{1}\ziju{0.02}研究生学位论文}
\end{center}
\vspace*{1.5cm}
\begin{center}
    \heiti\kaishu\zihao{2}\ \
    {\vspace*{0.2cm}{\LARGE\bf XXXXX}}
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\begin{center}
    \textrm{\zihao{3}{\ziju{1.2}{\LARGE\bf XXXXX}}}
\end{center}
\vspace*{0.5cm}
\begin{center}
    \kaishu\zihao{2}\ \ {{\ziju{0.7}xxx}}
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\vspace{1.5cm}
\begin{center}
    \hspace{-1.7cm}{\kaishu\zihao{3}院\hspace{32pt}所：数学与统计学院}\hfill
    {\kaishu\zihao{3} \hspace{-0.8cm}导师姓名：xxxx(教授) } \\
\end{center}

\begin{center}
    \hspace{-1.7cm}{\kaishu\zihao{3}学科专业：数学}\hfill
    {\kaishu\zihao{3} \hspace{-0.8cm}研究方向：xxxx} \\
\end{center}
\vspace*{0.4cm}
\begin{center}
    \kaishu\zihao{2}\ \ {{\ziju{0}二〇二五年五月}}
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%~~~~~~%%%%%%%%%插入空白页
\renewcommand\contentsname{目~录}
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\mainmatter
%%%%%%%%%%%%%%%%%%%%%%%%%
\newpage
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\parskip 6pt
\newpage
\pagestyle{plain} \pagenumbering{Roman}
\addcontentsline{toc}{chapter}{\numberline {\bf 中文摘要}}
\begin{center}
    {\heiti\zihao{4}摘~~~~~~~~要} \ \ \songti
\end{center}
\baselineskip 0.27 in
\vspace*{0.2cm} \ziju{0.09} \zihao{-4}
{\heiti\zihao{4} } \ \ \songti
从这里开始写摘要
%%%%%%%%%%%%%%%%%%%    
\hspace{-0.84cm}{\heiti\zihao{4}\bf{关键词}:} Stochastic Maxwell
\newpage
%~~~~~~~~
%%%%%%%%%%%%%%%%%%%%%%%%%开始设置英文摘要
\newpage
\pagestyle{plain} \addcontentsline{toc}{chapter}{\numberline {\bf 英文摘要 }}
%\newpage
\begin{center}
    \textbf{Abstract} %\vspace*{0.2cm}
\end{center}
\baselineskip 0.27 in
\vspace*{0.2cm}
\ziju{0.09}

\textbf{}%%%%%%%%%%%从这里开始写英文摘要
With the development of science and technology, 

%%%%%%%%%%%%%%%%%%%
\hspace{-0.84cm}\textbf{\zihao{-4}\textbf{Key words:}} %%%%%%%%%%%%开始写关键词
Stochastic Maxwell equation;

\chapter{前 \ 言 }%前言
本章介绍了与本文所研究课题相关的背景知识、发展概况以及我们所做的主要工作.
\section{问题的背景及研究现状}

\end{document}

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