Abstract: In order to deal with the distributed Management Information System(MIS) problems including fast information retrieval and so on, an information system platform based on Peer to Peer(P2P) structure was presented. The node model, the management scheme, and the information sharing flowswere given. In order to ensure the exact retrieval and the classified retrieval, an information search method based on distributed hash table and information clustering was given. In order to ensure the distributed multi-replica synchronization, a novel P2P multi-replica synchronization algorithm with a peer-to-peer lock was proposed. And the implement methodsand an instance system were given. Performance simulation results show that the platform can share information well, and has effective retrieval and fair fault-tolerant capabilities.