Abstract: The sweet spot of the sandy conglomerate reservoir in Baikouquan formation on the eastern slope of Mahu sag, Junggar basin is characterized by serious lateral superimposition, small thickness and strong heterogeneity. It is difficult to accurately predict this kind of reservoir with conventional data. OVT domain prestack seismic attribute analysis technology which takes azimuthal anisotropy analysis as the core can fully use the geological and fluid information contained in prestack datasets and do reservoir prediction more efficiently. But due to the influences of unstable energy, unbalanced density and relatively low signal noise ratio on original OVT domain gathers, the gather quality is not very good. Therefore, the paper introduces a new method which can use dynamic analysis to find the advantageous azimuth of gathers, do stacking of partial gathers and finally improve imaging quality and resolution of seismic data. The processed seismic data is used to predict the sweet spot reservoir distribution in the eastern Mahu area. The predicted area of the sweet spot reservoir is about 140 km2, which provides basis for well deployment and reserves estimation in the eastern Mahu area