A web service is programmatically available application logic exposed over Internet. With the rapid development of e-commerce over Internet, web services have attracted much attention in recent years. Nowadays, enterprises are able to outsource their internal business processes as services and make them accessible via the Web. Then they can dynamically combine individual services to provide new value-added services. A main problem that remains is how to discover desired web services. In this paper, we propose a novel web services discovery strategy given a textual description of services. In particularly, we propose a new schema matching algorithm for supporting web-service operations matching. The matching algorithm catches not only structures, but also semantic information of schemas. We also propose a ranking strategy to satisfy a user’s top-k requirements. Experimental evaluation shows that our approach can achieve high precision and recall ratio.