\documentclass[12pt]{book}
%%%%%%%usepackges
\usepackage{atbegshi}
    \usepackage{textpos}
	\usepackage{changepage}
	\usepackage[]{acronym}
	\usepackage[]{graphicx}
	\usepackage{multicol}
	\usepackage{tikz}
		%%%%%%%%%%%%%نمایه %%%%%%%%%%
	\usepackage[xindy]{imakeidx}
\makeindex
		\usepackage[extrafootnotefeatures]{xepersian} 
	\settextfont[Scale=1.15]{B Badr}%{B Lotus}%{Yas}
\setlatintextfont{Times New Roman} 
\setdigitfont[Scale=1]{Yas}
	\defpersianfont\myFafont[Scale=.8]{XB Zar}%{XM Traffic}
	%%%%%%%%%%%
	
	 \AtBeginShipout{
\begin{tikzpicture}[remember picture,overlay]
\node (mypicture) at (19pt,-450pt) {\includegraphics[width=38pt]{{example-image-b}}};
%\draw (0pt,0.3\textheight) -- (0pt,-\textheight) -- (\textwidth,-\textheight) -- (\textwidth,0.3\textheight) -- cycle;
\end{tikzpicture}
}

	%%%%%%%
	\begin{document}
	\chapter{}
	این یک فصل است.
	\chapter{}
\baselineskip=1cm
این \index{الف}یک متن است
\index{ببب}
\index{ججج}
\index{تتت}
\index{خخخ}
\index{ععع}
\index{صصص}
\index{ییی}
\index{للل}
\index{ضضض}
\index{ثثث}

\printindex
\addcontentsline{toc}{chapter}{\rl{{نمایه}\hfill}}
\renewcommand{\indexname}{\rl{{نمایه}\hfill}}
\end{document}