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Application of complex analog and mixed signal circuit can greatly improve the equipment performance, but at the same time puts forward higher requirements for circuit fault diagnosis. To effectively improve the efficiency of fault diagnosis and solve the existing analog and mixed signal circuit fault diagnosis problems, we made scientific researches on the key technology such as fault feature selection,test node optimization, to implement construction of optimal test point set and automatic generation of knowledge representation based on fault feature extraction. According to the results of verification test based on typical equipment circuits, gets knowledge representation automatically and reduces the test points to 32% of total. The verification test indicates that the technique presented in this paper has good practicability and popularization value.