Abstract: Taking south rail roadway of two level in Chengjiao Coal Mine as the object, from the influencing factors of drilling, blasting, supporting and so on, the article studied and applied the mechanized operating line with hydraulic drill carriage drilling + air column smooth blasting + monorail hydraulic temporary support +"backhole loader + belt conveyor +mine car" continuous wast stone exhaust system. By applying the mechanized operating line, it increased the speed of rock excavation, reduced the labor intensity, and improved the working environment of heading face.