\documentclass{article}


\usepackage{graphicx}
%\usepackage{xepersian}
\renewcommand{\baselinestretch}{1.3}
%\settextfont{HM XNiloofar}

\begin{document}

\begin{figure}
\centering
\framebox{
\includegraphics[width=0.7\textwidth]{pic-08.jpg}
}
\caption{This is the title of the picture which is centered.}

\end{figure}

\end{document}