用 `subfig` 宏包的方案 ```tex \documentclass[journal]{IEEEtran} \usepackage{graphicx} \usepackage{subfig} \captionsetup[subfigure]{labelformat=simple} \renewcommand\thesubfigure{(\alph{subfigure})} \usepackage{hyperref} \newcommand{\subfigureautorefname}{Fig.} % the name is sub-figure-auto-ref-name \usepackage{mwe} % for use of sample images \begin{document} \begin{figure}[!t] \centering \subfloat[]{\includegraphics[width=2.5in]{example-image-a}\label{A}} \\ \subfloat[]{\includegraphics[width=2.5in]{example-image-b}\label{B}} \caption{LETTER } \label{LETTER} \end{figure} The letter A is shown in \autoref{A} \end{document} ```  ------ 另提供一个 `subcaption` 宏包的方案，这个宏包可用来替代 `subfig` 和 `subfigure`。输出无变化，不重复贴图。 ```tex \documentclass[journal]{IEEEtran} \usepackage{graphicx} % ref: https://tex.stackexchange.com/a/512010 \usepackage{subcaption} \renewcommand\thesubfigure{(\alph{subfigure})} \captionsetup[sub]{labelformat=simple} \usepackage{hyperref} \renewcommand{\figureautorefname}{Fig.} \usepackage{mwe} % for use of sample images \begin{document} \begin{figure}[!t] \centering \subfloat[]{\includegraphics[width=2.5in]{example-image-a}\label{A}} \\ \subfloat[]{\includegraphics[width=2.5in]{example-image-b}\label{B}} \caption{LETTER } \label{LETTER} \end{figure} The letter A is shown in \autoref{A} \end{document} ```