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Because of the instantaneity, ambiguity and diversity of related factors in the process of pre-split blasting, ？t is impossible to solve this problem by using experimental means. Based on a typical project, calculation and analysis of vibration effect are made by means of numerical simulation of pre-split blasting in this paper. The roduction process of the stress wave and the rule of pre-crack propagation are researched, and the damage range of surrounding rock is determined. The results show that vibration reduction rate is about 90% for 10 cm wide pre-crack.