To ensure safe mining operations at the Huluntu Mine, which employs a double-approach sublevel open stoping method, this study established a 3D numerical stope model using Flac software. The stability of the stope during mining was analyzed by evaluating variations in maximum principal stress, z-direction displacement, and plastic zonesacross different sublevels. Results indicate that the maximum principal stress, z-direction displacement, and plastic zones in the stope roof progressively increase as mining advances. To prevent rockbursts caused by large-scale collapse of upper goafs, it is recommended to implement waste rock filling or induced roof caving immediately for goaf treat-ment after completing mining in the top 2 sublevels.