Abstract: A case study was made on the prevention and control of low oxygen in return airway corner of fully-mechanized working face of 12 coal No.4 panel in Shendong Mining Area Bulianta Coal Mine, we analyze the reasons of “low oxygen” and “without low oxygen” in return airway corner in shallow buried depth close coal seam group mining in the same area with large mining face. Through ventilation system adjustment, return wind corner management, mining design, general fire seal design in roadway, surface backfilling and other technologies and multiple measures to successfully solve the problem of low oxygen in the return airway corner of fully mechanized working face and ensure the safe and efficient production of mine.