Abstract: The biggest advantage of active pressure determination is that it can effectively shorten the measurement time, thus, it has great significance to analyze how to save the time in gas pressure measurement of active air supply. First, we construct the coal seam gas pressure within the passive expression of the flow field around the borehole pressure measurement range, and the difference between the active and passive load balancing process of the flow field is analyzed, the saving time of active air supply in the measurement of gas pressure is determined; then, the formula of saving time by active air supply in the measurement of gas pressure is deduced theoretically, and the theoretical calculations and the field tests are comparatively analyzed. The results show that two methods are basically the same, the error is only 7.5%, and the active air supply can save about 50% time in the measurement of gas pressure.