提出了一种灵敏度序列字典法 ,可快速定位级联线性电路中单级子电路的故障 ,不管这个故障是何种性质 (硬、软、单、多 ) ;提出了逐级搜索法 ,可定位两级以上子电路同时发生的故障 ,不管这些故障是何种性质 .这种软、硬故障统一诊断字典法的继续和发展 ,使字典法成功地从“元件级”诊断进入了“子电路级”诊断 . A sensitivity sequence dictionary method is proposed to quickly locate single-stage sub-circuit faults in cascaded linear circuits, regardless of the nature of the fault (hard, soft, single, multi-level). A hierarchical search method is proposed to locate No matter what the nature of these faults, the continuation and development of the unified diagnostic dictionary method for both soft and hard faults enables the dictionary method to successfully enter “sub-circuit level” diagnosis from “component level” "Diagnosis.