The 172401 coal mining face of Dashucun Mine in Jizhong Energy Fengfeng Group was located in a prominent danger zone. The absolute gas emission during the mining was expected to be 10 m3 / min. The goaf gas in the goaf effectively reduced the gas concentration by adopting directional roof long drilling technology outside of the stopping line, and the technology solved the problems of high gas concentration during the recovery mining, and the gas overrun in the upper corner.