cjk

CJK is a macro package for LaTeX, providing simultaneous support for various Asian scripts in many encodings (including Unicode): Chinese (both traditional and simplified), Japanese, Korean and Thai.
A special add-on feature is an interface to the Emacs editor (cjk-enc.el) which gives simultaneous, easy-to-use support to a bunch of other scripts in addition to the above — Cyrillic, Greek, Latin-based scripts, Russian and Vietnamese are supported. [ctan.org/pkg/cjk]

CJK是一个LaTeX宏包，提供对多种亚洲文字的同时支持，涵盖多种编码（包括Unicode）：中文（繁体和简体）、日文、韩文和泰文。
一个特别的附加功能是与Emacs编辑器的接口（cjk-enc.el），除了上述文字外，还为其他多种文字提供了同时且易于使用的支持——支持西里尔字母、希腊字母、拉丁字母、俄文和越南文。 [ctan.org/pkg/cjk]

quickstart

\documentclass{article}
\usepackage{CJKutf8}

\begin{document}
\begin{CJK}{UTF8}{gbsn}

你好

\end{CJK}
\end{document}