The fault diagnosis algorithm using SDG(signed directed graph) as a model of the system is useful to operative diagnosis of fault which occurred in processes.

• 符号有向图(SDG)模型已被用于系统运行操作的故障诊断,系统图模型中节点表示部件,边表示故障传播特征,主要分析已知报警集合寻找潜在故障源的问题。