Abstract：Usual CDP stack technique greatly advances seismic exploration;however，it fails to truely exhibit the amplitude of zero-offset reflection response because of am- plitude variation with offset. On the basis of AVO principle，a new method is put forward，which applies the least squared weight stack to CMP gathers so as to fit approximately zero-offset reflection data. This method has the following advantages: ·The least squared weight stack is a reduced AVO technique and does not in- volve iterations，speeding up computation.The seismic section processed using this method has high resolution and hence favours lithology analysis.High amplitude fidelity，which makes the seismic section similar to zero一 offset section.
