\documentclass{report}

\usepackage{titlesec}
\usepackage{xepersian}
\begin{document}

\tableofcontents
\titleformat{\chapter}[display]
{\normalfont\huge\bfseries}{\renewcommand{\thechapter}{\tartibi{chapter}}
\chaptertitlename\ \thechapter}{20pt}{\Huge}
\chapter{نام}
\section{نام}
\subsection{نام}
\subsubsection{نام}


\chapter{نام}
\section{نام}
\subsection{نام}
\subsubsection{نام}


\chapter{نام}
\section{نام}
\subsection{نام}
\subsubsection{نام}
\end{document}