Due to the soft and broken characteristics of soft and outburst coal seam, the gas drainage borehole easily collapses with low borehole completion rate and the blockage of gas drainage channel, which influence the efficiency of gas extraction. The open-closed reverse circulation bit was designed in order to solve these problems, and its working principle and structure characteristics were also analyzed. The advantages of full screen liner and reverse circulation drilling technology are combined with this bit, by reducing the second damage to the hole wall to improve the borehole completion rate and depth, by sending the full screen liner to the hole bottom to avoid wall collapse and gas drainage channel blockage, the utilization rate of the gas drainage borehole is increased. The paper introduces this new bit about its configuration design, working principle and the application.