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Web services provided a new solution for reusing and assembling Web software or components under the distributed service-oriented architecture and across-platform environment with a series of XML-based protocols. An architecture-based service composition model based on the architecture life-cycle is proposed, which provide a mechanism for dynamic service management and deployment. It also guarantees the version control of service components and a manageable evolvement process of application system. In addition, a kind of relationship-oriented service composition description language, i.e., RSCDL, for describing the composition process is investigated, which can guarantee that the complex services can be composed of the reused atomic services by different structural types and can provide a value-added service to different users.