Optimal selection of stope structure parameters is of great significance to safety production and economic benefits of mines.This paper,taking a silver polymetallic deposit in Inner Mongolia as an example,based on the mining method and mining technical conditions of the mine and using the orthogonal experiment design method,9 numerical simulation schemes with different stope structure parameters are designed based on the length,width and height,and Rhinoceros modeling software coupled Flac^3D simulation analysis software is used to numerically simulate and analyze the one-step and two-step mining methods in the 9 schemes.Range analysis was conducted for each index of the 9 simulation schemes.The results showed that the height of the approach has a greater impact on these indicators,followed by width and length.Finally,comprehensive considerations of the safety,economy and technology determined the stope structural parameters of Scheme 5,in which the approach length is 25 m,width is 3.5 m,height is 3.5 m,to be the best.Field industrial test shows that the Scheme 5 is the best,with mining loss rate to be 8 %,ore dilution rate 5 %,and increased ore drawing efficiency.Besides,the ground pressure can be effectively controlled during extraction,and the safety,economy and efficiency are ensured.