Abstract: In view of the problem that the gas emission of Y484 working face of kailuan (group) co., LTD. Tangshan mining branch is affected by the change of surface atmospheric pressure, the ventilation resistance of working face is measured and analyzed, and the relationship between the change of surface atmospheric pressure and the gas emission of working face is analyzed. based on the calculation of ventilation network and ventilation pressure regulation, the reasonable position and area of regulating pressure of Y484 working face were found out. Relying on the mine monitoring system, the surface atmospheric pressure and working face gas are monitored in real time. According to the monitoring data, a set of pressure regulating device that can realize automatic control is developed. When the local atmospheric pressure and the gas on the working face reach the set value, the pressure regulating device can be automatically opened to achieve the purpose of restraining the gas gushing out of the goaf on the working face, reducing the gas concentration on the working face and realizing the safe and efficient production of the working face.