%\documentclass[11pt,a4paper,two column,english]{article}
\documentclass[11pt,a4paper,twocolumn]{article}
%\usepackage[T1]{fontenc}
%\usepackage[latin1]{inputenc}
%\usepackage{babel}

\usepackage[font=small,labelfont=bf,tableposition=top]{caption}
\usepackage{blindtext}
\usepackage{cuted}

\begin{document}
\title{one column figure in two column article}
\author{Hadi Safi aghdam \\ forum.parsilatex.com}

\maketitle

\blindtext

\begin{strip}
\centering\noindent
\rule{110mm}{50mm}
\captionof{figure}{\blindtext}
\end{strip}

\blinddocument

\end{document}