针对目前模拟电路子网络级故障诊断方法普遍存在的问题，提出了一种新的诊断方法，阐述了该方法的诊断原理，给出了可诊断性条件，通过仿真例子，证明了该方法具有测试量少，方法简单，实时性好，适用于非线性电路等特点 Aiming at the problems existing in sub-network-level fault diagnosis of analog circuits at present, a new diagnosis method is presented. The diagnostic principle of the method is given and the diagnostic conditions are given. The simulation example shows that the method has the advantages of testing Less amount, simple method, good real-time, suitable for non-linear circuit and so on