Abstract: Fault block-5 of GangdongⅡ area belongs to meandering river deposition,with characteristics of thin sand body thickness and sand-mud interactive sedimentation.Because of conventional limited seismic resolution,the needs of the structure and reservoir research can not be satisfied.Due to the uncertainty of the seismic wavelet extraction,the deconvolution processing is poor in practical application.By adopting the approach of the wavelet compression,the high frequency expanding technology can not only improve the resolution but also keep the time-frequency characteristic of the original seismic data and relative amplitude relation,and the reflection details between the layers get rich.The verification of fixed wells shows a high agreement degree and it provides reliable basic data for sand body prediction.