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文中提出一个描述ＷＷＷ 结构的网站图Ｓｉｔｅ－Ｇｒａｐｈ 模型，在此基础上进行用户访问行为分析，从而提出了一个考虑实际访问请求模式的代理缓存系统ＵＲＡＣ．文中详细描述了ＵＲＡＣ的工作原理，对代理缓存设计时所要解决的命中率、一致性和替换算法等主要问题进行了讨论，并给出了性能分析，得到ＵＲＡＣ以提高命中率和降低访问延迟为目标是一个更加实用的代理缓存系统的结论
In this paper, a Site-Graph model of WWW site map is proposed. Based on this, a user access behavior analysis is proposed, so a URAC proxy cache system considering the actual access request mode is proposed. In this paper, the working principle of URAC is described in detail. The main problems of hit rate, consistency and replacement algorithm are discussed in the design of proxy cache, and the performance analysis is given. The URAC is obtained to improve the hit rate and reduce the access delay as The goal is a more practical proxy caching system conclusion