Abstract: With the selected the relative stable period of the mine ventilation system as an approved period and with the calculation of the mine required ventilatio n, the required ventilation quantity of each mining and excavation working face, chamber and standby working face could be set up.According to the calculation of the m ine ventilation capacity, the rational mining and excavation ratio of Dawan Mine was 1 : 4, the mine ventilation capacity was 1 .30 million tons, the mine equivalent hole was 3.97 m2 and the mine was a easy ventilation mine.From the mine ventilation dynamics, the effective ventilation quantity at the ventilation location, the mine ventilat ion network capacity, gas diluted capacity and other aspect, the mine ventilation capacity was verified as 1.30 million tons.At the each ventilation location, the air flow w as stable and the ventilation quantity, air velocity and air resistance could meet the requirements. The mine ventilation network capacity could meet the requirements of t he production and safety.