Abstract: Considering that the acceleration time history response contains the structure characteristic information, and the wavelet packet energy distribution varies in different condition of the same structure, the characteristic information of the structure was excavated in the eyes of wavelet packet energy. Taking the serial acceleration time history response from shake table tests of a reinforced concrete bridge column as the object of study, the wavelet packet method was used to carry on the statistical analysis of the wavelet packet energy character of the different condition, including the mean, the variance, the standard deviation, the relative average deviation, and the relative standard deviation of wavelet packet energy. The results of different index indicate that the mean of wavelet packet energy can represent the rule that the structure response increases gradually with the increase of acceleration; the values of different index under the same conditions vary with the dynamic performance and stiffness distribution of structure.