xeLaTeX example

xelatex.tex

% 使用xelatex, 且存成utf-8, 用%!来控制TeXShop选择xeLaTeX
%!TEX TS-program = xelatex
%!TEX encoding = UTF-8 Unicode

\documentclass[12pt]{article}
% 导言区
\usepackage{geometry}                % See geometry.pdf to learn the layout options. There are lots.
\geometry{letterpaper}                   % ... or a4paper or a5paper or ... 
%\geometry{landscape}                % Activate for for rotated page geometry
%\usepackage[parfill]{parskip}    % Activate to begin paragraphs with an empty line rather than an indent
\usepackage{graphicx}
\usepackage{amssymb}
\usepackage{tikz}

% fontspec.sty可以简化字体设置, 用/Applications/Font Book可以看到更多可用字体
\usepackage{fontspec,xltxtra,xunicode}
\defaultfontfeatures{Mapping=tex-text}
% \setromanfont[Mapping=tex-text]{Kai}
\setromanfont[Mapping=tex-text]{Songti SC Regular}  %宋体
\setsansfont[Scale=MatchLowercase,Mapping=tex-text]{Gill Sans}
\setmonofont[Scale=MatchLowercase]{Andale Mono}

\title{Brief Article}
\author{The Author}
\date{}                    %这个可省略

\begin{document}
\maketitle
% 一般人,上面的字体设置就够用了.
% Unicode must be typeset using a font containing the appropriate characters.
% Remove the comment signs below for examples.
% \newfontfamily{\A}{Geeza Pro}
% \newfontfamily{\H}[Scale=0.9]{Lucida Grande}
% \newfontfamily{\J}[Scale=0.85]{Osaka}

hello, everybody! \\
大家好! 中文哈.

\begin{tikzpicture}
\shade [ball color=green] (0,0) circle (.5cm);
\end{tikzpicture}

$x_2$  $x^4$ $\sqrt{3}$ $\lambda$ $\LaTeX$

\end{document}