In this paper, needle-plate, suspended metal particles and metal particles fixing on insulator surface models were put in gas insulated switchgear(GIS) entity model. Discharge waveforms were detected by ultrasonic sensor at the same voltage. According to the characteristics of discharge waveform, 7 characteristic parameters were extracted as the inputs of the S_Kohonen network to identify discharge types. The recognition result is good. This indicates that S_Kohonen network has some practical values.