Based on 5201 fully mechanized caving face in Luan Wangzhuang Mine, J type ventilation system was used to control gas, which taking return airway in goaf as gas emission passage during pushing forward working face.Simple small section support was applied to the corner of bolting and shotcreting suppport tunnel after mining.Meanwhile, this system guaranteed reliability and security of ventilation section and gas security system of “one into the two row” was formed.According to its application in fully mechanized caving face, it basically adjusted gas flow direction from the gas source in the area to avoid gas entering working face, which ensured all gas from gas source were fully drained and prevented gas aggregating in working face or upper corner so that guaranteed safe and efficient production.