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本文分析了峒室微差爆破的机理以及选用微差时间间隔的原则。对国内外近十个微差时间间隔选取的经验公式和十几个获得较好爆破效果的微差爆破工程实践所使用的时间间隔进行了数据回归分析，研究表明时间间隔选取主要应根据土岩性质，而不能机械地采用某一经验公式确定。同时，结合大量工程实践，按爆破大小分类，给出了时间间隔选取的大致范围。
This paper analyzes the mechanism of the vernacular millisecond blasting and the principle of choosing the time difference of the millisecond. Based on the empirical analysis of the empirical formula of the selection of nearly ten millisecond time intervals in domestic and abroad and the time interval used in the practice of a few millisecond blasting projects with better blasting results, the study shows that the time interval selection should mainly be based on the soil samples Nature, and can not be mechanically determined by an empirical formula. At the same time, combined with a large number of engineering practice, according to the classification of blasting size, given the approximate range of time intervals selected.