Abstract: Gas in upper corner and return current of Tashan coal mine working face,the thick coal seam caving mining is an average of 14.81 m,is the key factor which restricted safety production in mechanized mining face.Group companies and Tashan coal mine cooperated with Chongqing and Shenyang institute of China Coal Technology & Engineering Group CORP in to achieved good results and ensured safe production by using gas drainage and other means.