\caption{\footnote{This is a footnote}}
會(huì)出現(xiàn)報(bào)錯(cuò)：

Error: ! Argument of \@caption has an extra }.
Error: ! Paragraph ended before \@caption was complete.

這是因?yàn)閒loating object里面需要特殊處理footnote
解決方案為

\begin{figure}[ht!]
    \centering
    \includegraphics[width=0.4\textwidth]{fig.eps} 
    \caption{This caption \protect\footnotemark[5]  \label{this:figure} }
\end{figure}
\footnotetext[5]{Footnote text be placed here, right after}