Gob side entry technology  can reduce the amount of roadway mining, alleviate the mining tension, also effectively prevent accidents and reduce mining costs. The coal column-free mining technology of Xingtai Mine advancing with the workface back mining, with means such as roadway filling to maintain and retain the original back mining roadway along the edge of the mining area, thus eliminating the coal column of the guard roadway and using it as the workface in the next section, which provided a reference for the workface roof reinforcement of the mine.