\documentclass[10pt]{report}
%\usepackage[demo]{graphicx}
\usepackage[tight,footnotesize]{subfigure}
\usepackage{graphicx}
\usepackage{grffile}
\usepackage{caption}
\usepackage{fancyref}
\usepackage{float}
%\usepackage{subcaption}
\graphicspath{ {images/} }
\usepackage{amsfonts}	
\usepackage{amsmath}
%\usepackage{xepersian}
%\settextfont[Scale=1]{XB Niloofar}
%\setlatintextfont[Scale=1]{Times New Roman}


\begin{document}
 \author{ }
 \title{t}
 \date{\today}
 \maketitle
\include{chapter1}
 \chapter{•}
  \section{}

\begin{figure}[ht]
 \centering
  \includegraphics[scale=0.3]{./figure/coordinatezig.png}
   \caption{}
    \label{fig:coordinatezig.png}
     \end{figure}
 
 
\begin{figure}
 \centering
\begin{subfigure}[b]{0.5\textwidth}
   \includegraphics[scale=0.5]{./figure/specz4.png}
    \caption{}
     \label{fig:specz4.png}
\end{subfigure}
   
\begin{subfigure}[b]{0.5\textwidth}
     \includegraphics[width=\textwidth]{./figure/specz14.png}
      \caption{}
       \label{fig:specz14.png}
\end{subfigure}
        
\begin{subfigure}[b]{0.5\textwidth}
     \includegraphics[width=\textwidth]{./figure/specz20.png}
      \caption{}
       \label{fig:specz20.png}
\end{subfigure}
         \caption{}\label{fig:aslfig}
\end{figure}
\end{document}