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Ontology makes traditional web service to be semantic web services, where semantic annotation can be employed to discover, reason and composite web services semantically. The construction of ontology is a key factor to implement semantic web service applications. Traditionally, ontology is constructed and maintained by domain experts with considerable effort, which is difficult to proceed in an engineering way and to reuse existing domain knowledge. In this paper, we propose to use the ER model, which is widely employed in database management, to construct domain ontology and semantic web services efficiently and effectively.