Blast-induced vibration of the surrounding buildings(structures) essentially is caused by energy transfer.The combined effect of vibration intensity,spectrum characteristic,especially vibration duration on the damage of buildings can be reflected by energy method.The concept of momentary input energy can embody the combined action of vibration velocity and frequency.The damage of buildings is mainly depended on the maximum momentary input energy of blast vibration wave.In this paper,from the viewpoint of the damage mechanism of blast vibration energy,based on energy reaction equation,combined with the concept of momentary input energy,on the basis of Hilbert spectrum method,a model of momentary input energy of blast-induced vibration and the calculation method of the maximum momentary input energy are brought forward.