According to the catastrophe theory, catastrophe progression method of working condition evaluation of mine ventilation system safety state was presented. Based on the previous researches, eight main factors including the main ventilator surge incidence, the eligibility of disaster prevention facilities, gas content over-limit frequency of the excavation and mining faces, miss rate of mine ventilation system safety state, air supply-demand ratio in air-using site, resistance percentage of mine air-returning section, diagonal branches of unstable air current in air-using zone, and mine effectiv...
