CF3Igas has a very low potential value of greenhouse effect and excellent insulating property,so it has be-come one of the potential substitute gases for SF6.In this paper,the BOLSIG+software is used to solve the binomi-al approximate Boltzmann equation of CF3I-CO2 and CF3I-N2 mixed gases under the conditions of 0.1 MPa and 300 K,and the reduced ionization coefficient(α/N),reduced adsorption coefficient(η/N),reduced effective ioni-zation coefficient(α/η)/N and reduced critical breakdown field strength(E/N)cr of CF3I mixed gases under dif-ferent proportions are obtained.By comparing and analyzing the insulating properties of the two mixed gases,it is concluded that CF3I-N2 mixed gas is more likely to be a substitute gas for SF6 gas.
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