Traditional directly without consi methods to resolve the proxy server memory space problems are passive, cache objects dering the cache value of them, and replace them when the memory of the proxy server is not enough, there is no effect of the caching. This paper irttroduced a cache access mechanism, proposed a caching strategy based on value pre-assessment, described the pre-assessment algorithm of cache value. Simulation results showed that the running system with the cache strategy had a higher hit rate of the document and the character.%传统方法解决代理服务器内存空间不足的问题都是被动性方法,在没有考虑缓存对象的缓存价值的情况下直接对它们做缓存,在代理服务器内存不够时再将它们替换,使得部分无缓存价值的对象毫无效果地被缓存了一遍.本文引入了缓存的准入机制,提出基于价值预评估的缓存策略,描述了缓存价值的预评估算法,仿真实验结果表明采用本缓存策略的系统运行有较高的文档命中率和字符命中率.
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