In recent years,severe rock fall occur in stopes with large-diameter longhole mining in Tonglushan Copper-iron Mine.The investigation and analysis shows that the problems occurring in drilling and blasting techniques are the main reasons of rock falling in the stopes.Therefore,it can greatly improve stability of stopes and help to extend the application of large-diameter longhole mining method to enhance qualities of drilling.This paper introduces the present state of the application and research of longhole drilling techniques for large-diameter longhole mining method.On the basis of these,this paper discuss the plan of improving the qualities of large-diameter longhole drilling in Tonglushan Copper-iron Mine.It can give guidance to the drilling work for the future in this mine.