Based on the character of short-time non-stationary random signal, the feature of energy distribution of multi-interval-time in millisecond blast signals was investigated by means of the wavelet packet method. Firstly, the characters of wavelet transform and wavelet packet analysis were introduced. Secondly, three single deck blast vibration signals were analyzed by wavelet packet based on software MATLAB and the change of energy distribution curve at different frequency bands was obtained. Finally, the law of energy distribution of single deck blast vibration signals was analyzed and the influence of distance from blasting center on frequency bands energy distribution of blasting vibration signals was principally explored. The results show that the dominant frequency bands of blast vibration signals tend to be low, and its frequency band becomes wider.