\documentclass{book}
\usepackage{tocloft}
\usepackage{titlesec}
\usepackage{xepersian}

\begin{document}
\tableofcontents


\titleformat{\chapter}[display]
{\vspace{5cm}\normalfont\huge\filcenter\bfseries}{\renewcommand{\thechapter}{\tartibi{chapter}}
\chaptertitlename\ \thechapter}{20pt}{\Huge}[\clearpage]

\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}