renewcommandthefigure{Aarabic{figure}}

section{IX. APPENDIX}

subsection{bf 1. Comparison of Computational Methods}

XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX    Fig. ref{FigA1-methods}

begin{figure}[htbp]

center

includegraphics[width=0.28textwidth]{FigS2.eps}

setcounter{figure}{0}

caption{(Color Online) Comparison of energy

label{FigA1-methods}

end{figure}

参考： http://blog.163.com/fengyanghe@yeah/blog/static/69816811201331223943743/

begin{figure*}[!b]
centering

setcounter{MYtempcnt}{value{figure}}%保存当前编号,latex中图片的计数器名为figure,公式为equation

setcounter{figure}{2}   %手动设置图片2的编号为2

%或者addtocounter{figure}{1}让图片的计数器加一。

includegraphics[width=5in]{2.jpg}

setcounter{figure}{value{MYtempcnt}} %恢复当前图片编号

end{figure*}

%如果是公式，那么把figure改为equation。