Time frequency analysis method is used to analyze the time domain and frequency domain of seismic waves at the same time according to the principle of wavelet transformation.The time frequency of wavelet transformation increases with the increasing of signal frequency.This can satisfy well time frequency analysis of multi graduation characteristic signal.It has been proved by practice that sedimentary cycle possesses good correspondence with the main extremum frequence;the corresponding main extremum frequence of normal sedimentary cycle changes from high frequency to low frequency in ascending order;the anticycle sedimentation is opposite.This correspondece could be used in sequence stratigraphic division and source reservoir cap rock assemblage prediction

and also in the recognition of sand body property.