Abstract: The chamber blasting with bar charges is used in rock dig of openpit, railway road, hydroelectric industry and other projects.This paper introduces an example about urban controlled blasting by applying bar charge primarily, combining spot charge and bar charge, and combining common chamber blasting and hydraulic chamber blasting, combining chamber blasting for loosening and chamber blasting for fortifiying loosening, meet with success.High-speed, safety, good blasting results bave been obtained.