\documentclass[a4j,11pt,oneside]{jarticle}
%\setlength{\textwidth}{41zw}
%\setlength{\textheight}{780pt}
%\setlength{\oddsidemargin}{10pt}
\pagestyle{empty}

%-----------------------------------------------------------------------------
% Include usepackages
%-----------------------------------------------------------------------------
\usepackage{graphicx}
\usepackage{tabularx}

%-----------------------------------------------------------------------------
% Define recommands and commnads
%-----------------------------------------------------------------------------
\renewcommand{\arraystretch}{1.0}
\renewcommand{\figurename}{Fig.}
\renewcommand{\tablename}{Tab.}

\begin{document}
%-----------------------------------------------------------------------------
\section*{sample}
\begin{figure}[htbp]
 \begin{tabularx}{\textwidth}{cc}
  \begin{minipage}{0.5\textwidth}
   \begin{center}
    \includegraphics[scale=1.0]{.eps}
    \caption{}
    \label{}
   \end{center}
  \end{minipage}
  \begin{minipage}{0.5\textwidth}
   \begin{center}
    \includegraphics[scale=1.0]{.eps}
    \caption{}
    \label{}
   \end{center}
  \end{minipage}
 \end{tabularx}
\end{figure}
\begin{figure}[htbp]
 \begin{tabularx}{\textwidth}{cc}
  \begin{minipage}{0.5\textwidth}
   \begin{center}
    \includegraphics[scale=1.0]{.eps}
    \caption{}
    \label{}
   \end{center}
  \end{minipage}
  \begin{minipage}{0.5\textwidth}
   \begin{center}
    \includegraphics[scale=1.0]{.eps}
    \caption{}
    \label{}
   \end{center}
  \end{minipage}
 \end{tabularx}
\end{figure}
%-----------------------------------------------------------------------------
\end{document}