中文摘要：

针对Web服务组合，给出了输出分解匹配度、服务关联图等概念，并提出一种基于描述逻辑的Web服务动态组合算法．该算法综合考虑了服务的语义、服务组合的质量和效率等因素，可以自动地根据用户的服务请求实现服务的动态组合．

英文摘要：

Aiming at the problem of web service composition, we presented the definitions of matching degree of service decomposition, service relationship map and etc and proposed an algorithm for dynamic composition of web services based on description logics. The algorithm considers not only the semantics of services but also the quality and efficiency of service composition. It can implement dynamic composition of services according to user＇s service request automatically.