Abstract: The features of energy distribution for blasting seismic wave which is short-time non-stationary random signal are analysed by wavelet transform technique. According to the time-frequency characteristic and multiresolution decomposition of discrete wavelet transform, the signal history of blasting seismic wave is expressed by different level reconstructed signals of wavelet decomposition. By using these signals, the relative energy distribution of blasting seismic wave in different frequency bands and the regularity of vibration strength varying with time is obtained. Blasting seismic wave measurement shows that the time-frequency characteristic analysis based on wavelet transform yields more accurate information of blasting seismic wave. The suggested method provides a new approach for analyzing the structural safety under blasting vibration conditions.