Abstract: Aiming at the coal seam gas occurrence conditions in No.31 air shaft of Chaohua coal mine,the control process of implementing "four step" method to expose loose thick coal seam is drew up.According to "four-step" uncovering coal method to determine various aspects of management and control content,each step of the work quality is examined and tested.The "four step" method is safe to expose loose thick coal seam of 13 m in No.31 air shaft,and there is no gas overrun and side falling accident.