Based on the idea of substitution theorem, this paper presents a new fault diag-nosis method of subnetworks in tolerance analog circuits, and it is applicable to nonlinear large net works.

• 基于网络分析中置换定理的思想，本文提出了一种适用于非线性电路有容差情况下，模拟电路子网络经故障诊断的新方法。