本文是对模拟电路故障诊断的一项理论研究．文中提出了故障激励论．把模拟电路的故障等效为电路中的激励，可以有效地解决故障诊断问题．还提出了故障激励的基本形式及其数学表达式，以及若干故障诊断的定理，揭示了模拟电路中故障诊断的基本规律． This article is a theoretical study of analog circuit fault diagnosis. The article put forward the fault incentive theory. The analog circuit fault equivalent circuit excitation, can effectively solve the problem of fault diagnosis. Also put forward the basic form of fault excitation and its mathematical expression, as well as a number of fault diagnosis theorem revealed the basic rules of fault diagnosis in analog circuits.