\documentclass[12pt]{article} 下面加入
\usepackage{graphicx}
插入图片
\includegraphics[width=0.8\textwidth]{fig1.eps}
\begin{figure}[htp]
\begin{center}
\includegraphics[width=450pt]{image/arch_02.png}
\caption{描述文字}
\label{fig:arch_02}
\end{center}
\end{figure}