基于分类问题的普遍性,针对复杂系统的诊断问题,提出一种层次分类诊断模型,并解决了其中的关键技术问题.论述了如何建立诊断问题的分类层次和证据模式;提出了诊断知识的组织模型与表达方法;并给出了完整的推理控制算法.以这一模型为基础,建立了一个汽轮发电机组故障诊断专家系统. Based on the universality of classification problems, aiming at the diagnosis of complex systems, a hierarchical classification diagnosis model is proposed and the key technical problems are solved.How to establish the classification level and evidence mode of diagnosis problems is proposed. The organization of diagnosis knowledge Model and representation method, and gives a complete algorithm of reasoning control.On the basis of this model, a fault diagnosis expert system of turbo-generator set is established.