I did
\floatstyle{boxed}
\restylefloat{figure}
so all of my figures are with frames. This works well, but there is a place I do not want frame, how can I change it locally?
I did
\floatstyle{boxed}
\restylefloat{figure}
so all of my figures are with frames. This works well, but there is a place I do not want frame, how can I change it locally?
Once you create a figure, it is set in a box that can move around. However, once set, it stays as is. So, you can temporarily change the style by localizing a change and restyling:

\documentclass{article}
\usepackage{float,graphicx}% http://ctan.org/pkg/{float,graphicx}
\floatstyle{boxed}
\restylefloat{figure}
\begin{document}
\begin{figure}
\includegraphics[width=\linewidth,height=3\baselineskip]{example-image-a}%
\caption{This is figure one}
\end{figure}
{\floatstyle{plain}
\restylefloat{figure}
\begin{figure}
\includegraphics[width=\linewidth,height=3\baselineskip]{example-image-b}%
\caption{This is figure two}
\end{figure}
}
\begin{figure}
\includegraphics[width=\linewidth,height=3\baselineskip]{example-image-c}%
\caption{This is figure three}
\end{figure}
\end{document}
It's best though, for the sake of consistency, to wrap this in your own environment, which also localizes the effect:
\newenvironment{noboxfigure}[1][ht]
{\floatstyle{plain}\restylefloat{figure}%
\begin{figure}[#1]
}{\end{figure}}