Abstract: In the case of lower signalto-noise ratio and smaller stack fold,the result of conventional data processing is not satisfactory.So the frequency splitting processing should be used to improve data quality.We divide seismic data into several bands according to the spectral analysis and energy scanning.Respectively,we apply automatic residual statics,crosscorrelation statics,surface consistent amplitude compensation,inverse Q filter,noise elimination and adaptive dip area method to the data.Finally,we get stack section by adding up seismic reflection wave energy of each band.