Wuerxun fault depression in Hailaer Basin is characterized by complex structure, developed faults and oil-bearing sand bodies in fan delta front. In order to solve the problems of small distribution range, thin thickness and difficult prediction of oil-bearing sand body, the discrete tuned seismic data body in frequency domain is obtained by seismic matching and tracking frequency division processing. The waveform characteristics of single frequency seismic section are clear, the energy is enhanced and the resolution is improved. Based on 3D dominant frequency division seismic data, the 3D contour and favorable reservoir distribution of fan delta front sandbodies of Nantun Formation in Tongbomiao fault zone are finely depicted. Through comprehensive analysis, it is considered that Tongbomiao fault zone is controlled by eastern provenance and develops fan delta-sublacustrine fan-semi deep lake (deep lake) sedimentary system. The prediction results of this technology conform to the geological law and are in good agreement with the drilling results.