\documentclass{book}
\usepackage{xepersian}
\settextfont{XB Niloofar}
%وسط چین کردن فصل‌ها در ابتدایی هر فصل
\makeatletter

\def\@makechapterhead#1{%
  \vspace*{50\p@}%
  {\parindent \z@ \centering\normalfont
    \ifnum \c@secnumdepth >\m@ne
      \if@mainmatter
        \LARGE \bfseries \@chapapp\space  \@tartibi\thechapter
        \par\nobreak
        \vskip 20\p@
      \fi
    \fi
    \interlinepenalty\@M
    \Huge \bfseries #1\par\nobreak
    \vskip 40\p@
  }}
\def\@makeschapterhead#1{%
  \vspace*{50\p@}%
  {\parindent \z@ \centering
    \normalfont
    \interlinepenalty\@M
    \Huge \bfseries  #1\par\nobreak
    \vskip 40\p@
  }}
  \makeatother

\begin{document}
\appendix
\chapter{آزمایش}
مثال
\end{document}