Laying empty blast hole is a commonly effective blasting method in presplit blasting,and the quality of the blasting depends on the choice of empty hole spacing.It analyzes the stress concentration effect around the empty blast hole in theory,and there is stress only in the hole connecting direction in the wall of an empty hole.By analyzing the relationship between the empty hole spacing and the blasting parameters and combining with the theory of explosion and elastic mechanics,we can get the best choice of empty hole spacing.The best charge hole spacing is 868.6 mm when there is an empty hole between two charge holes,but the best spacing is 543.4 mm.So laying empty blast hole can enhance explosive energy utilization ration obviously.