\documentclass{book}
\usepackage{hyperref}
\usepackage{tocloft}
\usepackage{xepersian}
\settextfont{XB Yas}
\makeatletter
\def\@chapter[#1]#2{\ifnum \c@secnumdepth >\m@ne
	\refstepcounter{chapter}%
	\typeout{\@chapapp\space\thechapter.}%
	\addcontentsline{toc}{chapter}%
	{\@chapapp~\protect{\numberline{\tartibi{chapter}\,:\space #1}}\dotfill}
	\else
	\addcontentsline{toc}{chapter}{#1}%
	\fi
	\chaptermark{#1}%
	\addtocontents{lof}{\protect\addvspace{10\p@}}%
	\addtocontents{lot}{\protect\addvspace{10\p@}}%
	\@makechapterhead{#2}%
	\@afterheading}
\makeatother
%\renewcommand{\cftchapleader}{\cftdotfill{\cftdotsep}}
%\setlength{\cftchapnumwidth}{5.5em}
\begin{document}
	\tableofcontents
	\chapter{فصل اول}
	\section{عنوان بخش اول}
	\chapter{عنوان فصل دوم}
	\section{عنوان بخش اول}
	\subsection{عنوان زیر بخش اول}
\end{document}