Abstract: Based on the summarization of current research work on historic data storage in P/S systems,the paper presents a distributed algorithm to store historic data in P/S systems by proxies.The proxies are organized to form an overlay network.Cconsistent hashing is used to locate metadata agent,and topic data are stored by segments.Topic file indexing,parallel reading and other methods are applied in order to improve the performance.In comparative experiments,the proposed algorithm outperforms in load balancing and scalability.