Abstract: As having a relatively lower exploration degree inside buried hill in the Wen’an slope of Baxian sag, based on jointing prestack 3D seismic data of high precision in the sag, the research about structure characteristics and reservoir conditions has been carried out systemically inside buried hill in the Wen’an slope. It is thought that the western layer inside buried hill in slope connects hydrocarbon source rocks of the fourth member of Shahejie Formation and Kongdian Formation in subsags, with wide oil supply window that oil and gas perfuse inside buried hill along unconformities and faults, which can accumulate in multiple buried hill traps of the slope, such as anticline, fault nose, and fault block. Therefore, a reservoir mode has been built for layered inside buried hill and layered anticline of “ young source in old reservoir ” in Wen’an slope. It is studied comprehensively that the next favorable exploration direction is anticline, fault nose and fault block in the southern slope with good trap type and shallow depth, closing to hydrocarbon subsags of Baxian and Maozhou, both of which supply oil.