Abstract: Sulfur hexafluoride gas iswildly used in the p roduction and usage of high voltage device because of its excellent insula2 tive and are eliminating performance. For all kinds of reason , sulfur hexafluoride gas and its toxic disintegrant caused by electric arc at high temperatures are discharged into atomosphere, which pollute the environment and have harmful influence on the normal operation of electric device and peop le’s health aswell . The aim of this paper is to discuss the reasonable messure to decrease or eliminate the harmful effect.