Partial discharge test, as a kind of non-destructive test, is one of the important methods electric power equipment insulation detection and diagnosis. People is higher and higher requirement for the reliability of the power equipment, for now, most of the power equipment accident is caused by equipment insulation partial discharge, based on the measured wave of the four types of partial discharge is analyzed, it is concluded that the wave spectrum characteristics of the different types of partial discharge, which will provide a scientific basis for partial discharge pattern recognition feature extraction.