First, install texlive-lang-cjk or texlive-lang-chinese or texlive-lang-all. Then in tex file, add:
usepackage[T1]{fontenc}
usepackage{CJKutf8}
newenvironment{SChinese}{%
CJKfamily{gbsn}%
CJKtilde
CJKnospace}{}
Whenever a Chinese character is needed, use
begin{SChinese}凡end{SChinese}
Other examples like underline, underdot, etc., can be found in
/usr/share/texmf/doc/latex/latex-cjk/examples