Abstract: In order to further improve the recovery rate of coal resources, reduce the number of driving teams in production mines, reduce the driving footage and driving rate of roadways, and eliminate the hidden danger of coal spontaneous combustion and the impact of concentrated pressure caused by the coal pillars in the goaf, Shendong mining area vigorously promotes the innovation and application of the mining technology without coal pillars, and innovates the soft mold concrete construction technology and the roof cutting and pressure relief construction technology The key innovative equipment, such as hydraulic support, embedded anchor cable and constant resistance anchor cable, has been researched and developed for the gob side entry retaining process. The various pillar free mining technology methods, such as gob side entry retaining, gob side entry digging and filling mining, have been improved, the efficiency of pillar free mining has been improved, significant economic benefits have been created, and good mining results have been achieved. In this paper, the pillar free mining in Shendong mining area has been studied The key technology and application of the system are introduced.