对计算机的系统级故障进行诊所的研究已发展了几十年,随着计算机网络的发展,将系统级故障诊断的思想用于计算机网络的故障诊断中,相应也取得了许多成果。本文的研究根据现代计算机网络的特点,提出了在三值模型的基础上,对网络进行分布式系统级故障诊断的算法,它主要有以下特点: ①适用于一般拓扑结构,特别是广域网系统,为了保证诊断的正确性,每次只诊断出一个故障结点加以维修,即采用顺序诊断方法。 The research on computer system level fault diagnosis clinic has been developed for several decades. With the development of computer network, the idea of ​​system level fault diagnosis is used in the fault diagnosis of computer network. Correspondingly, many achievements have been made. According to the characteristics of modern computer networks, this paper proposes a distributed system-level fault diagnosis algorithm based on the three-value model. It mainly has the following characteristics: 1) It is suitable for general topologies, especially for wide area network systems, In order to ensure the correctness of the diagnosis, only one fault node is diagnosed at a time to be repaired, that is, a sequential diagnosis method is used.