Abstract: Lufeng 13 Sag is one of the main hydrocarbon rich basins in the Zhuyi Depression. However, commercial oil and gas discoveries are concentrated in the slope zone and central anticline zone of the depression only, making it particularly urgent to expand the exploration into steep slope zones. Based on the three-dimensional seismic interpretation and structural analysis of the research area, the structural style of the steep slope zone in Lufeng 13 Sag was dissected as a whole, revealing the segmented and staged evolution characteristics of the steep slope zone. The steep slope zone was divided into three structural types of inheritance, transformation, and migration, as well as six structural styles of single fault inheritance , double fault inheritance , migration, slip transformation , bottom invasion transformation, and structural transformation . Based on the quantitative analysis of the segmented fault activity in the main control zone of the research area, an approach was proposed to construct a spatiotemporal framework for complex steep slope zones with "dynamic and static, steep and gentle" structures. The spatiotemporal evolution characteristics of each section of the steep slope zone were clarified, and the spatiotemporal distribution characteristics of the Paleogene large-scale sand transport in the steep slope zone were clarified from the source. Finally, three exploration favorable areas in the steep slope zone were selected and their oil and gas accumulation patterns were predicted. The above understanding provided a reference and guidance for oil and gas exploration in the steep slope zone of the Lufeng 13 Sag.