Abstract: Aiming at the specific heat environment of thermal chamber (pump house, winch room and substations) under Yongchuan Coal Mine, it conducted the field measurements. According to the measured temperature, humidity and air flow results, it analyzed its degree of heat injury. It used black-box method to calculate dissipation capacity of chamber heat. By using the new air handling method, it calculated the required cooling load of each chamber under the condition of all new air and half new air handling. Finally, on the basis of the characteristics analysis of chamber heat injury, it proposed the chamber cooling method of the common air conditioning after explosion-proof processing, which could enrich and improve our mine cooling equipment system.