Web services have already become one of the most important computing resources and software assets in the Internet. With the increasing number of Web services, how to find the required services efficiently or how to gain the best service from the vast service sets become important. The semantic description of Web service and the efficiency of OWL-S retrieval model of semantic Web service are the key to the discovery of the Web service. This article proposes the OWL-S framework of semantic Web service, and adopts OWL-S to describe the Web service, and raises pointed matching algorithm. Through experiments, in this model, together with the semantic Web service technology, the dynamical searching and composition of Web service are implemented, so that the precision ratio and the recall ratio of Web service can be improved.