Abstract: In view of non-stationary characteristics of short-time blasting vibration and quick abrupt change and the signal spread in three directions，and combining with the measured data of hole-by hole blasting in an open pit mine，the energy distribution of vibration signal in axial，radial，vertical direction at a certain point was analyzed by adopting the wavelet analysis method.The results showed that maximum frequency-band energy and peak particle velocity were basically in the same position with a proportional relationship，but sometimes some individual maximum frequency band energy was different.Three-directional vibration signals of hole-by-hole blasting were differently distributed into different frequency bands.The energy at each direction mainly concentrates within 250 Hz，and will disappear beyond 250 Hz; The blasting resonance less impacted on buildings，because the building's natural frequency at surrounding is lower and the vibrating energy at 140 m away from explosion source mainly concentrates in 15 Hz or more.The result provides a new approach for safety evaluation under blasting vibration conditions.

Key words: Hole-by-hole blasting, Vibration monitoring, Vibration signal, Wavelet transform, Energy distribution