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Service Oriented Architecture(SOA)and Service Oriented Computing(SOC)are prevailing technologies for sharing and reusing resources. Service composition is an envisioned methodology used in SOA and SOC to build value-added services. The existed service composition models are mostly information technology expert-oriented and there is few considering the requirement from the point of view of end-users. Different with the IT experts，who can express their requirements using precise and well-formed formal language and understand the formal description of web service，the end-users are unnecessarily to be sophisticated on the complicated knowledge of computer science and are prone to consider the service composition in fuzzy and rough fashions.