Abstract:In order to study the influence of the fault of blasting seismic wave propagation law, choose in 385 near middle level fault FⅢ - 0 450 lines to 24 and 26 points. Matlab software is used to analyze the blasting vibration signal measured by vibration meter .Empirical mode EMD is used to decompose the high frequency band first and then transition to the low frequency band until the last component .The three - dimensional spectra, energy distribution, marginal spectra and instantaneous energy graphs of time - frequency - energy were obtained by HHT transformation .By comparing and analyzing the blasting vibration signals before and after passing through the fault, the energy amplitude of the blasting seismic wave decreases, but the energy of the low-frequency part increases .The marginal spectral band width, energy dispersion and low frequency function are more obvious .The peak value of instantaneous energy spectrum decreases by about 10 times, and the duration of vibration increases, indicating that the effect of low frequency is stronger.