This study investigates the application of advanced 3D laser scanning technology in the blasting design for mining in two-step junderground stopes. The method rapidly acquires 3D coordinate data of the goaf and generates high-precision 3D models along with comprehensive rock physical property data, providing precise parameters for blasting design. Compared with traditional survev methods. integrated mobile 3D laser scanning technology not only improves the efficiency and accuracy of data collection but also, when combined with mining software, enables efficient integration of the 3D model with the design scheme. This significantly enhances the precision of the blasting plan and the safety of the stope. Analysis of a practical case validates that this method significantly reduces ore loss and increases the resource recovery rate and operational efficiency. In that case, the ore recovery rate in the stope exceeded 95 %, providing strong technical support for safe and efficient mining operations.