Abstract: In order to study features of energy distribution for blasting vibration signals, an energy analysis method for blast-induced seismic based on power spectrum is put forward. In some extent, power spectrum density can be regarded as the characterization of relative size of the energy of a certain frequency harmonic. Then a method for calculating the energy-frequency distribution of blasting vibration is derived. Example analysis shows that this method is effective. And the comparative analysis shows that the principle of this method is consistent with the method based on wavelet transform. The method based on power spectrum achieves the transformation from time domain to frequency domain by using spectral analysis. So this method is simple in operation, quite clear in physical meaning, and it can be understood easily.