Abstract: Low oxygen and high carbon monoxide often appears in the upper corner of the surface of shallow buried coal seam mining. This paper analyzes in detail the reasons for the phenomenon of low oxygen and high carbon monoxide in the upper corner of the comprehensive mining surface of Sandaogou Coal Mine. By adopting measures such as forecasting of spontaneous combustion, adjusting the ventilation system of the working surface, reducing the ventilation resistance of the mine, reducing the air pressure of the main ventilators, strengthening the plugging up and down the well, reducing coal retention in the empty mining area, accelerating the speed of the working surface, and strengthening the sealing management of the empty mining area and nitrogen injection in the empty mining area, it effectively solves the phenomenon of low oxygen and high carbon monoxide in the upper corner during the recovery of the comprehensive mining face, and ensures the safe recovery of the working face.