Abstract: Prerequisite of forming a drawbell is that to make a cutting shaft with long hole blast by one time on block caving mine.In order to get cutting shaft safely and successfully construction technology under the production process of DU411 to construct [?]762 mm empty hole and SimbaH1354 trolley construction [?]76 mm long hole in Pulang Copper Mine Based on the summary of the physical and mechanical properties of ore-bearing rock mass， the maximum tensile stress failure criterion and Mises criterion were adopted to carry out the theoretical calculation of the fracture zone and fissure zone formed by long hole blasting in four main ore-bearing rock masses.The results showed that the design of cutting holes should be arranged according to the scope of the fracture zone.The auxiliary and peripheral holes should be arranged according to fracture area.On this basis， the design parameters of long hole in cutting shaft were determined.According to the principle of compensating space requirement to achieve blasting effect，combined with the advantage of electronic detonator can determine the blasting time at will，the blasting time of each hole was calculated according to three stages such as rock breaking，flying to fill the compensation space， and axial moving out of the height range to form a new compensation space，on the basis，a method of determining t3 by the motion of free falling body driven by the aftershock was proposed，the effect of continuously creating compensation space with blasting was achieved.Through field tests，a cutting well with a height of 18 m and a section of 4 m×4 m was formed by a single medium-deep hole blasting.By using the technical scheme successfully tested， the mine has safely and high-quality completed the medium-deep hole blasting of 250 ore collecting slots， and no safety and quality accidents occurred in the process.

Key words: mine blasting, cutting shaft, blasting parameter, compensating space