摘要：During the recent years,Service-Oriented Computing(SOC),as a new computing paradigm,has been widely accepted in academies and *** and more service-oriented computer system analysis and design, methodologies have been *** is believed that if a service-oriented methodology is based on compatible concepts and description methods between the application domain and the system responsibility,it would take more ***,in this paper,a Unified Service Description Language(USDL)is suggested based on our understanding of service and its attributes to unify description of web service and general service in application *** a demo in DELCCA project,USDL is asserted to efficiently support service oriented analysis and design.