\documentclass[preview=true, class=article]{standalone}
\usepackage[width=17cm]{geometry}
\usepackage{xepersian}
\pagestyle{empty}
\settextfont[Scale=1.1]{Yas}
\setdigitfont[Scale=1.1]{Yas}
\renewcommand{\baselinestretch}{1.5}
\begin{document}
\setlength{\parindent}{1.5em}
\setlength{\parskip}{0.3em}
\frenchspacing