In this paper,the development of study on blasting cut hight calculation in demolishing building by controlled blasting is introduced．Based on energy conversion theory,the criteria determing minimum blasting cut height are given．The criteria are simplfied in terms of theory of progression．The practica lmethod of calculating blasting cut hei ght is given．The analysis of practical examplesi llustrated that the practicalc alulation method is of practical signifi cance for demolishing building by contro lled blasting．%介绍了爆破缺口高度的研究现状,以能量转化理论为基础给出了确定爆破缺口最小范围的判据,借助级数理论对判据进行了简化,得出了爆破缺口高度实用理论计算方法。通过实例计算分析,证明了文中的实用理论计算方法对工程实践有指导意义。
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