SF_6/N_2 gas mixture is a temporary choice for SF6 replacement as insulation dielectrics. We used the collision ionization theory to illustrate the mechanism of the temperature influence on the insulation performance of SF_6/N_2 gas mixture. Moreover, we verified the experimental results of the insulation performance of SF_6/N_2 gas mixture by theoretical analysis, which was one of SF6 alternative choices, under high pressure and low temperature at-35 ℃,-18 ℃ and 0 ℃. The sphere-plate and rod-plate aluminum...