\documentclass[12pt,a4paper]{article}
\usepackage{pst-node}           % PSTricks package for nodes
\usepackage{pst-tree}           % PSTricks package for nodes
\usepackage{xepersian}

\begin{document}

\[
\def\pstreehookiii{\psset{thislevelsep=3cm}}
\pstree[treemode=R,levelsep=1cm,radius=2pt]{\Tc{4pt}}{%
\pstree{\TC*}{%
\pstree{\TC*}{\Tr{X_1} \Tr{X_2}}
\pstree{\TC*}{\Tr{Y_1} \Tr{Y_2}}}
\pstree{\TC*}{%
\pstree{\TC*}{\Tr{K_1} \Tr{K_2}}
\pstree{\TC*}{\Tr{J_1} \Tr{J_2}}}}
\]

\[
\def\pstreehookiii{\psset{thislevelsep=3cm}}
\pstree[treemode=L,levelsep=1cm,radius=2pt]{\Tc{4pt}}{%
\pstree{\TC*}{%
\pstree{\TC*}{\Tr{X_1} \Tr{X_2}}
\pstree{\TC*}{\Tr{Y_1} \Tr{Y_2}}}
\pstree{\TC*}{%
\pstree{\TC*}{\Tr{K_1} \Tr{K_2}}
\pstree{\TC*}{\Tr{J_1} \Tr{J_2}}}}
\]
\end{document}