Abstract: In order to solve the problem of high gas working face with multi-entry layout and the upper corner gas overrun under large mining heightand the improvement of the underground extraction system in the well, the invention can ensure the reliability of the non-wind and the gas discharge behind the working surface, The method of combining the theoretical analysis, the numerical simulation and the on-site practice is adopted to solve the problem that the gas over-limit of the upper corner of the upper corner is solved in a way that the partial Y-type ventilation of the working surface 5 and the two times of the working surface is realized by the stage-type gob-side entry way, However, the key to the realization of the stage-type gob-side entry is to determine the reasonable stage length and the support width of the filling body. The research shows that the movement of the surrounding rock of the Dayin coal mine along the gob-side retaining tunnel has experienced the influence of the mining and moving, the two stages of the retaining-lane stability stage,0-40m behind the working face, obvious deformation of the surrounding rock along the air-retaining tunnel, the stability of the 40-60m trend, and the requirements for the use of the gob-side entry; and at the same time, The ventilation system of the working surface is improved, and the ventilation problem of the goaf behind the working surface is solved.