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Current Web Service systems are based on "central" UDDI servers and syntactic description of Web Services, which are fragile and unscalable, and do not support Semantic Web Services. It is necessary to replace this UDDI structure with a new one. P2P is such an infrastructure, which allows the sharing of resources and services by direct interaction between equal nodes. Therefore, a discovery framework in p2p environment is proposed to replace traditional UDDI, by distributing the functions of the UDDI among all the peers in the P2P network. At the same time, An ontology-based mechanism is designed, which guaranteeing every service would be registered on a specific peer in the CAN-based P2P network, according to the service's ontology. By replacing the UDDI, our system improves the scalability and stability of the SWS system, and realizes an efficient ontology-based publishing and discovery of Semantic Web Services.