The stope structure parameters of the mine are important factors to ensuring safe and efficient mining. With the background of the I ore body of a copper mine in Yunnan Province, four different point column sizes were formulated by engineering analogy method, and the displacement and stress of the stope under different point column sizes were analyzed by FLAC3D numerical simulation software. The analysis results show that the most reasonable point column size is 5 m × 6 m ; when the excavation is to the fourth layer, The point column schemes of 4 m×6 m and 5 m×5 m exceed the maximum tensile stress capacity of the mining site, and the two schemes are excluded. The tensile stress of 5 m × 6 m and 6 m × 6 m mining sites did not reach the limit state, but the optimization effect of rectangular point column was significantly better than that of square point column. Finally, the reasonable point column size was determined to be 5 m × 6 m, which provided a good guidance for the stope test of the mine.