Abstract: Aiming at the problem of poor rationality and high mining cost of the stope structure parameters of Jiuzhanggou gold deposit, the structural parameters of the stope are optimized by FLAC^3D numerical simulation, and the better stope span is obtained.The field industrial test is carried out in Jiuzhanggou gold mine, and the economic benefit statistics and calculation work are carried out in the test stope, and the economic benefits of the test stope are obtained.The results of numerical simulation show that the limit span of the upper inlet mining field in Jiuzhanggou gold deposit is 8.0 m, and the damage degree of the stope is lighter.The results of field industrial test show that 7.0 m has good economic benefit as the span of stope, which ensures safe production and improves mining efficiency.