Abstract: The absorption and attenuation attributes based on spectrum characteristic analysis are primary references in the poststack domain.Because there exist some problems in the process of detection using conventional spectrum analysis technique,improvements were done in the analytical method and spectrum estimation algorithm.The technique of comparing differences of power spectrum estimated from separated time window emerges as the times require.On the basis of setting up time window up and down concentrated development segment of the oil layer,power spectrum is obtained from seismic signal by ARMA model.Thus,the difference of spectrum subsequently is obtained to predict oil-bearing capability qualitatively by comparing the differences of power spectra in corresponding window.Also,this paper introduces the calculation procedure,analytical method and algorithm advantage.It is shown that the technique has a high sensitivity and satisfactory prediction effect of oil-bearing capability,as shown by model testing and actual application to Nm Formation in the west of Chengbei fault zone.