Web service composition is very important in web service technology. Domain Ontology is used for semantic web service match and automatic web service composition. When a web service is registered, it will be related to the concepts in the domain ontology with its output concepts. To start a semantic match or composition starts, only the related web service with the annotated concept will be used. The approach can deal with not only the sequential but also the parallel service composition problems The proposed approach was verified by experiments and case studies.