关键词: 面向服务, 可用性, 结构模型, 支撑平台, 动态配置

Abstract: A hierarchy available service computing framework is proposed in this article.It is composed of 3 layers which are organically integrated，i.e.the service-registration layer，the virtual service layer and the real service layer.The service-registration layer and the virtual service layer together compose the available service framework，which fulfills the registration of service，detecting validity of service，organizing service and treats the available configuration parameters as the one attribute of the framework，and the system can dynamically configure according to the available attribute automatically，and make it meet the needs of application.The framework，the implementing mechanism and the organizing protocol of that model are particularly described in this article.The analysis of the model and the simulations carried on the prototype demonstrate the validity of the model.

Key words: services oriented, availability, architecture, support system, dynamic configuration