In order to approach the reasonable stope structure parameters of sublevel stopingwith cemented broken-stone filling in Fengshan copper mine,a mechanical model was built upwith limited element method in hight of the geol0gical condition and the mechanical properties ofore/rock and fill mass in the mine to analyse the stress state around mined area so as to advancereasonable structure parameters for mined area,which can serve as referential basis for stope design.