给出当待诊断系统的模型为不确定因果理论时 ,基于模型诊断和模型中心诊断等概念 ,论证基于模型中心诊断与 U -S本原蕴涵 /蕴涵式的直接关系 ,并且根据知识不确定程度对候选诊断进行排序 .指出对经典因果理论基于一致性中心诊断和中心溯因诊断的刻划仅仅是文中刻划的对应诊断的两个特殊情形 When the model of the system to be diagnosed is uncertain causality theory, based on the concepts of model diagnosis and model center diagnosis, the direct relationship between diagnosis and U-S primitive implication / implication based on model center diagnosis is demonstrated. According to the degree of knowledge uncertainty Sorting out the candidate diagnosis.It points out that the classic causal theory based on the consistency center diagnosis and the center of the abscription diagnosis is only the text of the corresponding diagnosis of the two special cases