Abstract: To study blasting vibration signal from the features of energy distribution to control the blasting vibration hazard，and combined with the experiment of millisecond blasting simulation by indoor concrete slope，the variation law of the vibration signals energy and the peak velocity with the distance is studied with MATLAB 7.0 and the wavelet pocket technique.The weakening degree of vibration signals energy and peak velocity by damping ditch，and as well as its effect on the distribution of the energy are analyzed.The conclusion is that damping ditch makes the predominant frequency of blasting vibration signal energy concentrate on the low frequency band.Within certain limits，the decrease trend of peak vibration speed and total energy of blasting vibration signals gradually becomes weaker with the increase of the propagation distance.The blasting vibration signals with large peak vibration velocity may not necessarily carry large energy，and the energy is not just the character of vibration velocity.

Key words: Millisecond blasting, Wavelet packet analysis, Slope, Damping ditch, Delay time