Abstract: Coal seam gas seepage is one of the serious natural disasters that threaten the safety of coal mining,which is one of the main problems that need to be solved in the development of China, s mining industry. In this paper,the coal sample of briquette is taken as the research object,and the variation law of coal seam gas pressure under cyclic load is studied by numerical simulation experiment. The numerical simulation of this paper mainly uses Comsol Multiphysic software to study the evolution of coal gas pressure under different initial gas pressure conditions under cyclic loading,the evolution of coal gas pressure under different axial pressures,the evolution of coal gas pressure under different confining pressures,and the evolution of gas pressure under different stability times. It is found that: Under cyclic loading,different stabilization times have little effect on coal gas pressure. Under different initial air pressures,the gas pressure change law of coal body is not obvious;Under the same axial pressure,the trend of gas pressure is similar. During the coal circulation disturbance,under different axial load conditions,the larger the upper limit value of axial pressure load,the greater the amount of gas pressure change,and the closer to the axial pressure loading area,the higher the growth rate of gas pressure change. During the unloading process of different axial pressures of 4 MPa and 6 MPa,the change rate of gas pressure at each position of the coal body is different,but the lower limit of the coal body gas pressure has little effect. The evolution characteristics of gas pressure inside coal under different stability times were studied,and it was found that under cyclic loading,different stabilization times had little effect on coal gas pressure.