提出了一种基于图论方法的设备故障诊断模型，可以克服通常产生式系统知识获取的困难以及一般基于模型系统过分依赖于定性描述的不足。文中详细讨论了基于图论的设备建模方法和层次分解技术，借助于矩阵分析技术，提出了具体的诊断算法． A model of equipment fault diagnosis based on graph theory is proposed, which can overcome the difficulty of knowledge acquisition in common production systems and the deficiency of over-reliance on qualitative description in model-based systems. In this paper, the device modeling method and hierarchical decomposition technology based on graph theory are discussed in detail. With the help of matrix analysis technology, a specific diagnosis algorithm is proposed.