Abstract: For enhancing the reliability of service cooperation and simplifying the design process of exception handling，this paper introduces the supporting mechanism of double-layer norm-governed service cooperation into the virtual organization.In order to make the service consistent and reliable，it forms a dependence relation of exception at the function-norm layer through the dependence relation of service operations and then uses it to guide the supporting-norm layer to handle exception.It first gives out the definition of norm，and then illuminates an algorithm of forming the dependence relation of exception automatically and steps of exception handling.An example analysis is presented to explain this mechanism at the last part.

Key words: virtual organization, service cooperation, exception dependence, norm, exception handling

摘要： 为了提高服务协同的可靠性和简化异常处理设计过程的复杂性，在基于服务协同的虚拟组织中引入分层准则调控的服务协同保障机制，在功能准则层通过各业务间依赖关系生成异常依赖关联，从而在异常处理中通过异常依赖关联指导保障准则层的运作，并结合高效可行的运行机制，保障服务的一致性和可靠性。首先给出准则的定义，然后给出了异常依赖关联的自动生成算法，以及分层准则调控的服务协同保障机制，阐述了异常处理步骤，最后结合详细实例进行了情景分析。

关键词: 虚拟组织, 服务协同, 异常依赖, 准则, 异常处理