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\documentclass{article}
\usepackage{CJKutf8}
\begin{document}
\begin{CJK*}{UTF8}{gbsn}
\section{前言}
\section{关于数学部分}
数学、中英文皆可以混排。You can intersperse math, Chinese and English (Latin script) without adding extra environments.
\end{CJK*}
\bigskip  %% Just some white space
You can also insert Latin text in your document
\bigskip  %% Just some white space
\begin{CJK*}{UTF8}{bsmi}
這是繁體中文。
\end{CJK*}
\end{document}