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.