Abstract: Pressure balancing ventilation for fire prevention and control system is designed and applied in 1201 face and 1203 face of Bandingliangta Coal Mine. In negative pressure ventilation system conditions of main ventilator, the CO emission from sealed area of fire goes into the coal mining face by air leakage passageway of ground cracks and the overlying gob. Pressure balancing ventilation can successfully resolve this problem by building fans, air doors, air stopping and air regulator. In this way, a dynamic balance is realized between the working face air quantity and the air pressure of upper and lower coal seams. It shows that the pressure balancing ventilation for fire preventing and extinguishing system can enhance the air pressure of working face and educe the air leakage. Finally it can prevent CO emission from gob to working face.