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P2P technology is a new kind of architecture based on peer network. P2P implements the sharing of resources and services using the effective communication among the peers. Web service is a new technology used to develop distributed application. This paper introduces the concepts and technologies of P2P and Web service. Using JXTA protocol as the implementation technology of P2P and using JUDDI AXIS as the server of Web service, we design a Web service Platform in P2P environment and present a prototype system which is applied to publish, inquire and invoke Web services. JXTA peer services are deployed on UDDI peers so that this platform can implement the backup and self-organization of UDDI; The JXTA group services are built in order that the client peer can transparently visit all the UDDI registries; The same service is deployed on many client peers so that service requestor can invoke the service to execute parallel computing. The Web service platform in P2P environment given in this paper is appropriate for the Intranet UDDI registry.