During the recent years，Service-Oriented Computing（SOC)，as a new computing paradigm，has been widely accepted in academies and industry. More and more service-oriented computer system analysis and design methodologies have been proposed. It is believed that if a service-oriented methodology is based incompatible concepts and description methods between the application domain and the system responsibility，it would take more advantages. So，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 domain. With a demo in DELCCA project，USDL is asserted to efficiently support service oriented analysis and design.
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