Jinyuan mining company mainly adopts non-pillar sublevel caving mining method to mine 1012 orebody,upward fan-shaped medium longhole caving,sublevel height 15 m,approach spacing 15 m,which lead to large mining quantity and high tunneling cost.Therefore,the sectional height of 1012 orebody is raised to 30 m,the upward large-diameter fan-shaped longhole blasting technology is carried out,and the research method of combining numerical simulation with field test is adopted to determine the optimal stope drilling and blasting parameters:the lowest resistance line is 2.0 m,the hole bottom distance is 3.0 m,and the field test effect is good,which puts forward a new method and idea for large-scale mining in the stope.