Regarding to the low blasting efficiency in the drift excavation of in hard rock,blasting test is done in hard rock drift excavation of Xinglong Mining of Huili County. Analyzing the three cutting modes of the mixed cut,the single helix cut and the rect angular,the test results of various forms of blasting cut are abtained,and the reasonable cutting method and blasting parameters are selected out. The construction practice indicates that the average cycle drilling length reaches 1.7 m,and utilization rate o...