Abstract: The slope belt in the south of Dongying Sag is a typical graben-like depression.During the 30 years of exploration,10 oil-and-gas fields have been discovered.By analyzing the relationship among tectonic setting,sedimentary system and reservoir formation,it is deemed that,there exists close relationship between the large-sized successive normal structure,high system tract and the distribution of hydrocarbon reservoir.And then,the reservoir types and the crude properties of this kind of slope zone,from the edge to the center of the subsag,are summarized.The inspiration,from exploration of the slope belt in the Dongying Sag,is very important for such oil-and-gas exploration of the slope belt in the graben basin.