Abstract：A new united method，local grooving top-caving，is proposed by controlled explosion in disposing abandoned stope. The characteristics of the methods，location，width and depth of grooving，and thickness of loose rock cushion are studied，and the calculated grooving location is validated by two-dimensional finite element analysis，meanwhile the effective cutting roof is evaluated by acoustic emission technique and photography at Dongtongyu Gold Mine. The study results show that the new method is fulfilled at Dongtongyu Gold Mine. The calculation of width and depth of grooving obtained by theory are dependable，and the calculated grooving location is basically reasonable for the continuous and regular abandoned stope. However，for the complicated abandoned stope，the theoretical location is deviates from actual case and two-dimensional finite element calculation should be taken to correct the result. Application of the united methods can not only subtract continuous area of mining abandoned stope，and separate it with mining system on deep level，but also eliminate the hidden danger of large scale roof sudden falling，and make roof stress redistributed to keep safe production.
