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Web services composition is an important implementation technique of SOA. With such technology, services could be reused and cost could be reduced. Actually, web services are reused through web services composition while software architecture is one of the most valid approaches to realize the reusability. At the same time, SOA is under an open and ever-changing network environment and the users' requirements are varying continually, so that web services should support evolution in the run time. In this paper, we present web services composition approach based on dynamic software architecture to support dynamic evolution. Then, the architecture description language - XYZ/ADL which can represent both dynamic semantics and static semantics of the architecture is used to describe service composition based on dynamic software architecture model. Finally, a case study is given to illustrate the usability of this descriptive method of web services composition.