Abstract: Due to the disorder exploration of Xinyi Yinyan Tin mine in early stage，huge irregular mined-out areas were formed which badly threatened the production safety of the mine.Through investigation on the mined-out areas，its distribution and spatial pattern were grasped by a certain technical measure，and the treatment measures for these mined-out areas were proposed.Taking +1 060 m sublevel of mined-out areas as a case，a filling method with joint blasting of middle-depth and shallow holes was introduced，and the related experiences were summarized and analyzed. Underground mining|Treatment of mined-out area|Drilling blast|Cover