Abstract: In electronic equipment fault diagnosis,waveform identification is an important basis of features extraction and fault diagnosis.According to the requirements of real time monitoring and diagnosis system of certain type electronic equipment,two waveform identification methods are introduced: one method is the correlation analysis for identification of waveform,the other is the vague identification of waveform.Correlation analysis is to calculate the correlation coefficient mainly,and vague identification is to calculate the vague subordinate degree of waveform at monitored point.This two methods are based on standard waveforms,can analyze in real time the waveform data on-line,realize automatic identification of waveform in time domain.