Based on the geological conditions in the east mining area of in Daye Iron Mine,several stoping schemes with different stope structure parameters for sublevel caving without sill pillar were designed,the several stoping schemes were simulated and analyzed by numeral simulation software PFC.According to the ore recovery indexes and the difficulty of field construction,the optimal one among candidate schemes was recommend,i.e.12m sublevel height,15m access space and 2.0~2.5m caving step space.Moreover,the changing rule of contact forces among particles in different stages during ore drawing was studied.The reasons why the ore recovery rate obtained from the numeral simulation is higher than actual one but the ore dilution rate obtained from the numeral simulation is lower than actual one were analyzed in detail.