Under the influence of greenhouse effect, the application of sulfur hexafluoride gas is greatly restricted. SF6's potential greenhouse effect GWP is 23,900 times that of CO2, and its atmospheric life is 3,400 years. Up to now, the content of SF6 gas in the atmosphere has increased at an annual rate of 8.7%, and the gas accounts for more than 15% of the total gas emission in the temperature chamber. The primary source of SF6 emission comes from electrical equipment, accounting for about 70% of the total content. The 1997 Kyoto Protocol calls for a fundamental restriction on SF6 gas use by 2020. The toxicity of other differentiated products also makes it an urgent requirement for the development of power grid to find SF6 to replace gas in gas insulation equipment. Production and application units have begun to pay attention to gas which can replace sulfur hexafluoride.

At present, there are three types of substitute gases mainly studied: conventional gases (air, N2 and CO2), SF6 gas mixture and strongly electronegative gas and its mixture. In addition to the physical and chemical properties of the three types of gases, the electrical function of the experiment and theoretical exploration.