In the limited proxy cache space, inefficient cache hit rate and byte hit rate will increase the proxy cache node backbone network traffic consumption and response time. This paper proposes an efficient proxy cache management strategy. In the strategy, the independent information data fluctuation weighting method is used to decouple the correlation among indexes of cache objects to get the index weights, and then the comprehensive resident value of each cached object is calculated by linear weighting; based on generational garbage collection mechanism, the cache space is divided into three intervals according to the proportion and mapped to the three-generation cache. When the cache of each generation overflows, 20% of the cached objects with the lowest comprehensive resident value within the generation will be demoted or eliminated. The remaining 80% of the items will be upgraded or retained to achieve dynamic generation management of cached objects. Simulation results show that the strategy has a reasonable cache hit rate and byte hit rate and can significantly reduce backbone network traffic consumption and proxy cache response delay.