Abstract: In order to reduce the influence of blastingvibration on wall rock and roadbed,the divided charges are used to take place ofcentralized charge and then the interval between the divided charges isdetermined by engineering calculation based on stress wave spread inrock. The intreval between the divided charges is calculated based onthe relations between cracking circles and folded stress waves and therelations between cracking circles and folded stress are studied bystress wave theory and stress analysis of the folded stress that actedon the rock based on engineering practice. The rule and method for thedesign of the interval between divided charges are established throughmechanism analysis and engineering calculation under common conditionsand then validated by engineering practice. The rule and method mayserve as a guidance in the congener engineering blasting.