引入宏包：\usepackage{subfigure}
\usepackage{graphicx}

1 横排

统一大标题 三个小标题 单栏环境下

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\begin{figure}[!htb]

\centering

\subfigure[microwave]{

\includegraphics[width=0.31 extwidth]{pic/salepermonth_mic.png}
}
\subfigure[hair dryer]{
\includegraphics[width=0.31 extwidth]{pic/salepermonth_hair.png}
}
\subfigure[pacifier]{
\includegraphics[width=0.31 extwidth]{pic/salepermonth_pac.png}
}
\caption{Monthly sales curve for the top three products}
\label{fig:fig_micPerMon}
\end{figure}

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2 竖排

统一大标题 两个小标题 双栏环境下

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\begin{figure}[!htb]

\centering

\subfigure[Device-to-FN data transfer volume comparison]{

\begin{minipage}{0.5 extwidth}

\centering
\includegraphics[width=1 extwidth]{picture6a.png}
\end{minipage}
}
\subfigure[FN-to-IC data transfer volume comparison]{

\begin{minipage}{0.5 extwidth}

\centering
\includegraphics[width=1 extwidth]{picture6b.png}
\end{minipage}
}
\caption{Comparison of data transmission volume} \label{distribution:dataset}
\end{figure}

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致谢不编号

\section*{Acknowledgements}
The work is partially supported by