\documentclass[a4paper,svgnames]{book}
\usepackage{graphicx}
\graphicspath{{graphics/}}
\usepackage{geometry}
\geometry{left=42.5mm,right=42.5mm, top=54.5mm,bottom=53.5mm}
\usepackage{tikz}
\usepackage[explicit]{titlesec}
\usepackage{varwidth}
\usetikzlibrary{matrix,positioning,arrows,shapes}
\usepackage{xepersian}
\settextfont{Yas}

\newcommand*\chapterlabel{}
\titleformat{\chapter}
  {\gdef\chapterlabel{}
   \normalfont\Huge\bfseries}
  {\gdef\chapterlabel{\thechapter\ }}{0pt}
  {\begin{tikzpicture}[remember picture,overlay]
    \node[yshift=-5cm] at (current page.north west)
      {\begin{tikzpicture}[remember picture, overlay]
        \draw[fill=Yellow!12] (0,0) rectangle 
          (\paperwidth,5cm);
          \draw[green!55!blue!70,line width=.3cm] (0,0) -- (22,0);
           \draw[black!20,line width=0.15cm] (16,4.25) -- (20,4.25) -- (20,-1) -- (16,-1) -- cycle;
        \end{tikzpicture}
      };
    \end{tikzpicture}
  }

\titlespacing*{\chapter}{0pt}{60pt}{-60pt}


\begin{document}
\chapter{عنون فصل}
\end{document}