A building with complicated surrounding environment was planned to be demolition blasted, except for the toppling direction, around it are close-range existing facilities or experimental reserved buildings in three directions. A series of blasting and safety technical measures of unidirectional dumping with∠ shaped blasting cut, rational blasting parameters, reliable blasting network, rigorous protective structure, appropriate reinforced steel cutting technology at supporting column were taken in the design with meticulous construction management to ensure precise designed collapse direction in a safe range without recoil. At the same time, the harmful effects of blasting vibration, blasting slungshot and air shock wave were strictly controlled.