Mechanized upward horizontal slice stoping and backfilling method is adopted to mine the orebody existing in the east of line No.8 upward the elevation of-144 m at a certain mine in Anhui province.Several mining plans with different structure parameters of stope are simulated using ANSYS software.At last,a compositive analysis is made on the stress,displacement and the safety of stope roof,and optimized structure parameters of stope are obtained.