\documentclass[oneside,fleqn]{book}
\usepackage{tocloft}
\usepackage{fmtcount}
\usepackage{ptext}
\usepackage{xepersian}
\begin{document}
\makeatletter
\patchcmd{\@chapter}{\addcontentsline{toc}{chapter}{\protect\numberline{\thechapter}#1}}{\addcontentsline{toc}{chapter}{\protect{\numberline{\chaptername~\tartibi{chapter} :  #1}}}}{}{}
\renewcommand*\l@section{\@dottedtocline{1}{0em}{2.3em}}%
\makeatother


\tableofcontents

\renewcommand{\cftfigfont}{شکل }
\فصل{فصل}
\قسمت{قسمت}
\ptext[1]


\end{document}