\documentclass{tabriz-thesis}
\usepackage{xepersian}
\settextfont{XBZar}
\makeatletter
\bidi@patchcmd{\@chapter}{%
\addcontentsline{toc}{chapter}%
{\protect\numberline{\thechapter}#1}%
}{%
\addcontentsline{toc}{chapter}%
{\protect\numberline{\chaptername~\tartibi{chapter}}#1}%
}{\typeout{We succeded in redefining \string\@chapter}}
{\typeout{We failed in redefining \string\@chapter}}
\bidi@patchcmd{\l@chapter}{%
\setlength\@tempdima{1.5em}%
 }{%
\setlength\@tempdima{4em}%
}{\typeout{We succeded in redefining \string\l@chapter}}
{\typeout{We failed in redefining \string\l@chapter}}
\makeatother
\begin{document}
\tableofcontents
\chapter{همینجوری}
\end{document}