Abstract: In order to realize advance early warning of coal and gas outburst in mining and excavation working faces and to enhance the prevention and control ca pacity of the coal and gas outburst disaster, taking Zhaozhuang Mine as a study object, the paper investigated the fault drop affected to the gas desorption index K1ofd rlling cuttings and the drilling cutting value S, thus inferred affected to the coal and gas outburst and investigated the influence scope. When the fault drop was less tha n 5 m, the influence scope would be 30 m to the fault or the pinchout end. When the fault drop was 5 ~ 15 m, the influence scope would be 45 m to the fault or the pinch out end. When the fault drop was over 15 m, the influence scope would be 60 m to the fault or the pinchout end.