\documentclass[fleqn]{report}
\usepackage[demo]{graphicx}
\usepackage[labelformat=simple]{caption}
\usepackage{xepersian}
\renewcommand*{\thefigure}{\arabic{figure}}
\renewcommand*{\thetable}{\arabic{table}}
\begin{document}
\chapter{نام}
\begin{figure}[!h]
\centering
\includegraphics[width=5cm,height=2cm]{pic}
\caption{}
\end{figure}


\begin{table}[!h]
\centering
\caption{}
\end{table}

\begin{figure}[!h]
\centering
\includegraphics[width=5cm,height=2cm]{pic}
\caption{}
\end{figure}

\begin{table}[!h]
\centering
\caption{}
\end{table}


\chapter{نام}

\begin{figure}[!h]
\centering
\includegraphics[width=5cm,height=2cm]{pic}
\caption{}
\end{figure}

\begin{table}[!h]
\centering
\caption{}
\end{table}

\begin{figure}[!h]
\centering
\includegraphics[width=5cm,height=2cm]{pic}
\caption{}
\end{figure}

\begin{table}[!h]
\centering
\caption{}
\end{table}
\end{document}