Large size, large tonnage of equipment in large mining height working face increased the difficulty of working face backout caving, the fast rapid of recovery increased the number of working face moving. 3210 working face large mining height fully mechanized working face was taken as example, through optimizing dismantling supports way, stoping line place and the shape and size of retreat channel cross-section, three machine equipment retreat was conducted in 20 d, which improved the retreat speed of fully mechanized working face and provided reference for effective retreat of fully mechanized working face in similar mine.