Gas accidents in coal face threaten the safety production. Studying on gas emission law could help us avoid. The gas-solid coupling models with different mining styles were built up. Simulation of stress-displacement-gas coupling was made by Flac3D, combining with the background of Lu Ning coal. Results shows: the longer blasting time is, the larger plastic failure zones are; with the same external loads, strains of coal are larger when considering gas-solid coupling effect, gas flow to the coal face easily. Gas pressure turns to be nonlinear along tunneling direction used blasting, the longer blasting time is, the smaller gas pressure is. The gas pressure turns to be linear 0~10m to coal face with mechanical. The greatest variation of displacement and gas pressure are 0~3m to coal face, gas emission mainly occurred here.