\documentclass{article}
\usepackage[a4paper, top=2.5cm, bottom=2.5cm, left=2.5cm, right=2.5cm]{geometry}
\usepackage{graphicx}
% For chinese character
\usepackage{xeCJK}
\setCJKmainfont[AutoFakeBold=3]{AR PL UKai TW}
\XeTeXlinebreaklocale "zh"
\XeTeXlinebreakskip = 0pt plus 1pt