In view of the Huainan a heavy iron mine -500 m mining, FLAC3D was applied to build the modeling and simulate the excavation to analysis two kinds of mining scheme of stope stability. It shows that when the stope length to width positioning 30 m×30 m, stope keep stable with two rooms and three rooms mining at the same time, and the maximum stress concentration factor is 1.5, rock strength meet the stability requirement. When the stope length to width positioning 40 m×40 m and three stope mining, stress concentration factor is 1.7, the roof and filling body face shear failure under tension and compression because mined out exposed area is too large. In order to improve the mine production capacity, the scheme is selected that two stope structure parameter with 30 m×30 m and three stope mining as the mining project of mine excavation.