Abstract: On the basis of on-site collecting a lot of gas and geological data,with a large number of measured data,Using a method of combining gas and geological theory,gas geology laws in vertical shaft of Didaoshenhe coal mine No.18 coal seam are analyzed qualitatively and quantitatively.The influencing of geological structure,roof and floor lithologic,magmatic intrusion and coal seam floor elevation on gas occurrence is analyzed,and the gas emmission of coal mine is predicted.