根据冲击荷载作用下岩石声发射信号具有非平稳的特点，利用小波包分析技术对冲击荷载作用下岩石声发射信号的能量分布特征进行研究。首先，简略地介绍了小波包分析的特点。其次，基于MATLAB对岩石声发射信号进行小波包分析，得到了冲击荷载作用下岩石声发射信号在不同频带上的能量分布图。最后，总结了冲击荷载作用下岩石声发射信号频带能量的分布规律，重点讨论了对冲击荷载作用下不同岩石对声发射信号频带能量分布的影响。分析结果发现岩石的物理力学性质影响冲击荷载作用下岩石声发射信号频带能量的分布规律，即岩石密度越小、纵波波速越小、弹性模量越小，冲击荷载作用下岩石声发射信号的优势频率就越集中，且优势频率有往低频发展的趋势；单轴压缩强度和抗拉强度对冲击荷载作用下岩石声发射信号能量在优势频率内分布的影响不明显。

Based on the character of non- stationary signal，the feature of energy distribution in acoustic emission signals under impact loading was investigated by means of the wavelet packet method. Firstly, the characters of wavelet packet analysis were introduced. Secondly，eight 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 acoustic emission signals under impact loading was analyzed, and the influence of different rocks on frequency bands energy distribution of acoustic emission signals under impact loading was principally explored. The results show that frequency bands energy distribution of acoustic emission signals under impact loading was affected by different rocks，In other words, if the density of rock is less, the speed of the longitudinal wave is lower ,and the modulus elasticity is less, the dominant frequency bands of acoustic emission signals under impact loading become more energy-intensive and tend to be low；uniaxial compression strength and tensile strength have nothing with the dominant frequency bands of acoustic emission signals under impact loading.