答案1
由于不知道您到底想要什么尺寸和空间,我只能猜测,但以此为起点,您应该能够根据自己的喜好调整设计:
\documentclass{book}
\usepackage[T1]{fontenc}
\usepackage{titlesec,blindtext}
% For the chapter format
\titleformat{\chapter}[display]%
{\centering\Large\bfseries}% format of chapter
{\normalsize\normalfont\MakeUppercase{\chaptertitlename}\enskip\thechapter}% format of the label
{.5\baselineskip}{} % space between the two
\titlespacing*{\chapter}{0pt}{25pt}{\baselineskip} % spaces around \chapter{}, {left}{before}{after}
% For the section format
\renewcommand{\thesection}{\arabic{section}}% to get rid of the chapter number
\titleformat{\section}%
{\centering\large\bfseries}% format of section
{\thesection.}{.5em}{}
%\titlespacing*{\section}{0pt}{beforesep}{aftersep} % If you want to change the spacing around \section{} too
\begin{document}
\chapter{Some Chapter}
\section{Some Section}
\blindtext
\end{document}