Abstract: Taking the deep hole large stope in Anqing Copper Mine as research object， through optimizing the blasting parameters，and transferring the traditional undercutting method，the methods of the deep-hole variable cross-section spherical charges extrusion blasting technology，deep-hole coping blasting technology，deep-hole lateral caving technology are adopted to eventually form a stable and available bottom structure.This greatly accelerated the speed of undercutting and improved the overall recovery efficiency of long-hole mining method.Tests of undercutting in a stope indicated that each technical and economic indicator was better improved.At the same time，comparing with the traditional medium-deep hole undercutting method，the efficient deep-hole undercutting method saved about 15 d.So，it is very simple and has a significance of promotion.

Key words: Undercutting space, Drilling and blasting parameters, Extrusion blasting, Coping blasting, High efficiency deep hole, Brief