As a time-frequency decomposition method,the wavelet package transform can be used extensively. It is better than the wavelet transform. The wavelet package transform can divide the seismic data in more detail and better describe the distribution of effective wave and surface wave in the time-space field with the same frequency compared with the conventional Fourier transform. In addition, we can separate the surface waves from it. After reconstruction we can get the result of surface wave separation. The new method can separate surface waves successfully,and meanwhile it can also avoid the loss of the effective wave energy (particularly the low frequency energy),preserve the frequency band width of signal and raise the signal/noise ratio of the seismic data. Practice shows that it is very effective in surface wave separation.