Large diameter deep hole blasting has been used for ore caving mining in Zhangzhuang iron mine.To effectively control the blasting impact on the integrity of the high-stage slope,the mine introduced a smooth blasting technology based on the engineering characteristic of the mine and the application of existing controlled blasting technology when a new middle section increased to 90 m high.According to different linear charge densities,a blasting industrial test was carried out after fixing the blasting parameters such as the hole diameter,charging diameter and hole spacing.By using the goaf scanning technology,the boundary shape of the goaf was drawn after mining of the whole stope.And then,the actual effect of blasting tests in each group was analyzed.Finally,the main smooth blasting parameters suitable for the high-stage slope were determined as follows:the hole diameter was 165 mm,the charging diameter was 70 mm,the decoupling coefficient was 2.36,and the linear charging density was 2 kg/m.This technology has been widely used in the other stopes of Zhangzhuang iron mine.