\documentclass[11pt,a4paper]{report} 

% استفاده از بسته‌ی زیر الزامی نیست ولی با استفاده از آن می‌توانید لینکهای رنگی به مراجع خود داشته باشید. 
%\usepackage[colorlinks,citecolor=blue]{hyperref}
\usepackage[colorlinks=true,linkcolor=red,citecolor=blue,urlcolor=black,pagebackref]{hyperref}
\usepackage{setspace} 
\usepackage{array}
\usepackage{xcolor,color}
\usepackage{fancyhdr, graphicx}
%\usepackage[demo]{graphicx}
\usepackage{verbatim}
\usepackage{float}
\usepackage{caption}
\usepackage{subcaption}
\usepackage[top=30mm, bottom=30mm, left=30mm, right=30mm]{geometry}
\usepackage{indentfirst} %جهت ایجاد تورفتگی در اول پاراگراف
\usepackage{bidipoem}
\usepackage{amsthm,amssymb,amsmath}
\usepackage{xfrac}
\usepackage{multirow}
\usepackage{tabulary}
\usepackage{morefloats}
\usepackage{framed} 
%\usepackage[notlof]{tocbibind}%[notbib, notlof,nottoc]  
\usepackage{xepersian}
\numberwithin{equation}{section}
\defpersianfont\nastaliq{IranNastaliq}
\settextfont{XB Zar}
\setlatintextfont[Scale=1]{Linux Libertine}
\linespread{1.3}
\frenchspacing
%\usepackage{caption}  
%\captionsetup[table]{font=small,skip=0pt} 
\captionsetup[figure]{font=small,skip=0pt} 
%% Adjust here %or equivalently 
%\usepackage[font=small,skip=0pt]{caption}
\setlength{\textfloatsep}{20.0pt plus 2.0pt minus 2.0pt}
\setlength{\floatsep}{12pt plus 2pt minus 2pt}
\setlength{\intextsep}{12pt plus 2.0pt minus 2.0pt}
%\newlength{\drop}
\renewcommand{\bibname}{مراجع}
\pagestyle{plain} 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\makeatletter
\def\@makechapterhead#1{%
  \vspace*{50\p@}%
  {\parindent \z@ \if@RTL\raggedleft\else\raggedright\fi \normalfont
    \ifnum \c@secnumdepth >\m@ne
        \huge\bfseries \@chapapp\space \thechapter
        \par\nobreak
        \vskip 20\p@
    \fi
    \interlinepenalty\@M
    \Huge \bfseries\nastaliq #1\par\nobreak
    \vskip 40\p@
  }}
\renewcommand\section{\@startsection {section}{1}{\z@}%
                                   {-3.5ex \@plus -1ex \@minus -.2ex}%
                                   {2.3ex \@plus.2ex}%
                                   {\nastaliq\Large\bfseries}}
\renewcommand\subsection{\@startsection{subsection}{2}{\z@}%
                                     {-3.25ex\@plus -1ex \@minus -.2ex}%
                                     {1.5ex \@plus .2ex}%
                                     {\nastaliq\large\bfseries}}
\makeatother
\makeatletter 
\def\@chapter[#1]#2{\ifnum \c@secnumdepth >\m@ne
                         \refstepcounter{chapter}%
                         \typeout{\@chapapp\space\thechapter.}%
                         \addcontentsline{toc}{chapter}%
                                   {\@chapapp~\protect\numberline{\thechapter}#1}%
                    \else
                      \addcontentsline{toc}{chapter}{#1}%
                    \fi
                    \chaptermark{#1}%
                    \addtocontents{lof}{\protect\addvspace{10\p@}}%
                    \addtocontents{lot}{\protect\addvspace{10\p@}}%
                    \if@twocolumn
                      \@topnewpage[\@makechapterhead{#2}]%
                    \else
                      \@makechapterhead{#2}%
                      \@afterheading
                    \fi}
\renewcommand*\l@section{\@dottedtocline{1}{3.5em}{2.3em}}
\renewcommand*\l@subsection{\@dottedtocline{2}{5.8em}{3.2em}} 
\makeatother


%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\tableofcontents
\begin{center}
\null \vspace {\stretch {1}} 
\chapter{مقدمه}
\section{تست یک}
\subsection{تست دو}

\vspace {\stretch {2}}\null
\end{center}
\chapter{عنوان آزمایشی}
\end{document}