Nowadays,　there　are　many　Web　Service　in　the　network,　these　Web　Services　release　to　the　network　are　free,　can　not　be　classified　effective,　it　leads　to　Web　Service　Requesters　waste　lots　of　time　in　searching　for　appropriate　Web　Service.　For　accelerating　Web　Service　founded　and　enhancing　the　precision　and　exactness　of　searching　service,　this　paper　introduces　a　method　about　making　use　of　Ontology　Web　Language　to　classify　Web　Services,　and　how　to　speed　up　Web　Service　discovery.　Web　Service　classification　depends　on　the　matching　methods　to　compare　the　service　name,　input　and　output　parameter,　service　description　among　services　that　we　decide　to　classify.　We　determine　the　position　and　meaning　of　them　in　the　ontology　after　using　some　matching　algorithm.　Through　query　OWL　ontology　to　find　the　Web　Service　which　can　meet　our　needs.　For　confirm　our　study,　we　design　and　implement　a　Web　Service　Classification　and　Discovery　System　which　based　on　Semantic　and　in　the　environment　of　Multi-Agent.　©　2011　IEEE.