Abstract: According to the seismic, drilling, well logging, analysis and test data, the detailed sequence stratigraphic characteristics are researched about the fourth member of Shahejie Formation—Kongdian Formation of paleogene in the south of Jinxian sag by using sequence stratigraphic principle. The sedimentary models of different positions in the sag are established. At the same time, the sedimentary facies distribution and evolution characteristics are analyzed. The favorable direction of oil-gas exploration is determined. Research shows that the fourth member of Shahejie Formation—the third member of Kongdian Formation is a second-grade sequence, which can be divided into three third-grade sequences or eight fourth-grade sequences. Five kinds of sedimentary systems are identifi ed in this area, which are alluvial fan, delta, fan delta, nearshore subaqueous fan and alluvial plain. Two lithologic and structural-lithologic oil-gas accumulation areas come into being, which are the key zone for oil-gas exploration.