\documentclass{report}
\usepackage{ptext}
\usepackage{fancyhdr}
\usepackage{xepersian}
\renewcommand{\chaptermark}[1]{%
        \markboth{#1}{}}
\renewcommand{\sectionmark}[1]{%
       \markright{\thesection\ #1}}
\fancyhf{} % delete current header and footer
\fancyhead[RO]{\slshape\leftmark}
\fancyhead[LE]{\slshape\rightmark}
\fancyhead[LO,RE]{\slshape \thepage}
\renewcommand{\headrulewidth}{1pt}

\pagestyle{fancy}
\begin{document}
\chapter{اول}
\ptext[1-10]
\section{نام}
\ptext[1-10]
\chapter{اول}
\ptext[1-10]
\section{نام}
\ptext[1-10]
\end{document}