% 一级标题：第一章 绪论（对应\section）
\titleformat{\section}[block]
{% 字体设置
\centering % 居中对齐
\bfseries % 加粗
\fontsize{16pt}{16pt}\selectfont % 三号字（16pt），单倍行距
\CJKfontspec{SimHei}% 中文黑体
\fontspec{Times New Roman}% 西文Times New Roman
}
{\thesection}% 题序（如"第一章"）
{1\ccwd}% 题序与标题间空1个汉字宽度（1个空格）
{}% 标题内容前无额外内容
{}
\titlespacing{\section}
{0pt}% 左缩进
{15.6pt}% 段前距离
{15.6pt}% 段后距离
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 二级标题：1.1 研究背景（对应\subsection）
\titleformat{\subsection}[block]
{% 字体设置
\raggedright % 左对齐
\bfseries % 加粗
\fontsize{14pt}{14pt}\selectfont % 四号字（14pt），单倍行距
\CJKfontspec{SimHei}% 中文黑体
\fontspec{Times New Roman}% 西文Times New Roman
}
{\thesubsection}% 题序（如"1.1"）
{1\ccwd}% 题序与标题间空1个汉字宽度（1个空格）
{}% 标题内容前无额外内容
{}
\titlespacing{\subsection}
{0pt}% 左缩进
{9.1pt}% 段前距离
{9.1pt}% 段后距离
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%三级标题
% 2. 字体与样式（严格匹配要求）
\titleformat{\subsubsection}[block]
{%
\raggedright % 左对齐（无缩进）
\bfseries % 加粗
\fontsize{12pt}{12pt} % 小四号（12pt），单倍行距（标题自身行距=字号）
\CJKfontspec{SimHei}% 中文黑体
\fontspec{Times New Roman}% 西文Times New Roman
}
{\thesubsubsection}% 题序（如"1.4.1"）
{1\ccwd}% 题序与标题间空1个汉字宽度（1个空格）
{}% 标题内容前无额外内容
{}
\titlespacing{\subsubsection}
{0pt}% 左缩进（无）
{8pt}% 段前0.5行（基于当前字体的行高）
{8pt}% 段后0.5行
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%四级标题
% 四级标题完整配置（确保显示）
% 四级标题完整配置（与三级标题一致）
\newcounter{subsubsubsection}[subsubsection]
\renewcommand{\thesubsubsubsection}{\arabic{section}.\arabic{subsection}.\arabic{subsubsubsection}.\arabic{subsubsubsection}}
\titleformat{\subsubsubsection}[block]
{%
\raggedright
\bfseries
\fontsize{12pt}{15.6pt}\selectfont
\CJKfontspec{SimHei}
\fontspec{Times New Roman}
}
{\thesubsubsubsection}
{1\ccwd}
{}
{} % 无额外命令
\titlespacing{\subsubsubsection}
{0pt}
{8pt}% 段前0.5行
{8pt}% 段后0.5行（固定值，与三级标题一致）
% 简化自定义命令，移除强制行距
\newcommand{\subsubsubsection}[1]{%
\par
\refstepcounter{subsubsubsection}%
{\raggedright\bfseries\fontsize{12pt}{15.6pt}\selectfont\CJKfontspec{SimHei}\fontspec{Times New Roman}%
\thesubsubsubsection\hspace{1\ccwd}#1\par}%
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% 创建独立正文环境（强制固定行距20磅）
\newenvironment{maintext}{%
\begingroup% 局部作用域，隔离外部设置
\interlinepenalty=0% 允许段落分页
\brokenpenalty=0% 允许段落跨页
\raggedbottom
% 1. 核心：强制行距为20pt，不缩放
\linespread{1}\selectfont% 禁用行距缩放（关键！避免setspace宏包干扰）
\fontsize{12pt}{20pt}\selectfont% 字号12pt，行距绑定为20pt（第二个参数直接控制\baselineskip）
% 2. 锁定行距参数，不允许小于20pt
\setlength{\baselineskip}{20pt}% 显式设置基线距为20pt（双重保障）
\setlength{\lineskiplimit}{19.9pt}% 允许行距最小为19.9pt（仅比20pt小0.1pt，确保正文内强制20pt）
\setlength{\lineskip}{20pt}% 多行环境（如列表、表格）强制行距20pt
% 3. 正文格式设置
\justifying% 两端对齐
\setlength{\parskip}{0pt}% 段落间距0（避免干扰）
\setlength{\parindent}{2em}% 首行缩进2字符
\frenchspacing% 取消句末额外空格
% 4. 确保表格内行距同步为20pt
\AtBeginEnvironment{tabular}{\fontsize{12pt}{20pt}\selectfont\setlength{\baselineskip}{20pt}}
% 5. 移除\everypar强制命令（避免干扰标题后第一个段落）
}{%
\endgroup% 结束局部作用域
}
查看更多
