本文讨论了判别组合电路中固定型故障之间具有优势关系的一些条件。导出了一些故障等价和故障优势之间的规律,例如:在某些条件下原始输出端的故障可以优于原始输入端的故障。还提出了用故障关系树的方法精简电路的故障数,并且证明了在同一故障关系树中的不同故障不会互相屏蔽,可使多故障数大大减少。 This article discusses some of the conditions for determining the dominant relationship between fixed faults in a combinational circuit. Some laws of fault equivalence and fault benefits are derived. For example, a fault on the original output may outweigh the fault on the original input under certain conditions. It is also proposed to reduce the number of faults in a circuit by using a fault tree and to prove that different faults in the same fault tree do not shield each other and the number of multiple faults can be greatly reduced.