In order to deeply and accurately understand the influence of the characteris-tic parameters of the gas on its discharge characteristics,the effects of gas pressure,tem-perature and composition on the discharge characteristics under the wire-tube and wire-plate electric fields were analyzed respectively.The results show that as the gas pressure in-creases,the volt-ampere characteristic curve shifts to the right,and the breakdown voltage is approximately linear with the gas pressure when the gas pressure is low(＜0.08 MPa),and is basically logarithmic or exponential when the gas pressure＞0.08 MPa.By increasing from atmospheric pressure to 0.24 MPa,the breakdown voltage of the wire-tube type elec-tric field is elevated by 30%to 40%,and the breakdown current decreases by about 60%.Meanwhile,the breakdown voltage of the wire-plate type electric field rises by about 50%,and the breakdown current does not change much.As the gas temperature increases,the volt-ampere characteristic curve shifts to the left.The effect of gas composition on voltage is more pronounced than on current,and the magnitude of the effect is related to the pro-portion of electronegative gas in it.
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