Aiming at the problems of high risk and long construction period in demolishing a L-shaped building by manual pre-cutting and separate blasting,a one-time overall blasting demolition scheme with different collapse directions was designed for a 7-story L-shaped brick-concrete structure building.ANSYS / LS-DYNA dynamic finite element software was used to carry out numerical simulation for checking on the feasibility of the scheme.The failure mechanism of the main components of the building was revealed by analyzing the motion time-history curve of the top nodal points and the whole building′s collapse process,and the blasting effect was predicted.By dividing the building into three areas,designing the blasting incisions and the initiation network,and raising the height of the approximately trapezoidal blasting cut,the building was automatically divided into two parts at the corner.The north side of the building collapsed northward,and the south side of the building toppled westward,which made the building fully disintegrated upon touching the ground.The formation and closure of the actual blasting cut,the collapse process of the structure,the collapse range and shape of the building were basically consistent with the numerical simulation results,which means a good actual blasting effect.The time of collapse and disintegration was about 7 s.There was no recoil phenomenon in the reverse direction of collapse.The overall height of the blasting pile was about 8.9 m,and the blasting pile at the corner collapsed to the east about 2.1 m.Combined with the numerical simulation results,the suggestions of protection measures were presented to control the harmful effects of blasting and ensure the safety of the east protection target.