Abstract: In order to solve the problems of low accuracy and long duration of current coal seam gas pressure measuring method, through theoretical analysis, numerical simulation and field test, the principle of coal seam gas pressure measurement with active air supply is analyzed, and the influence laws of the factors such as air supply pressure, air supply duration, seam permeability and original seam gas pressure on measuring result of gas pressure are also studied. The results show that the measuring duration can be significantly shortened through active air supply. The colser to the original seam gas pressure the injecting air pressure is, the higher the seam permeability is, the longer the injecting duration is, the better the application effect is. The field tests also show that the method of gas pressure measurement with active air supply provides practical values for rapid and accurate measurement of coal seam gas pressure.