Abstract: The structural slope break zone (SSBZ) is initiated by the long term activity of syndepositional structure which constrains the change in the accommodation space of the basins, controls the development of the depositional sequence and the distribution of the depositional system tracts and the sand bodies, and results in the abrupt change of the depositional slope. Researches show that distribution of petroleum is closely connected with the SSBZ. Subtle traps are considered as the key exploration targets in the future. Traps formed by structural slope belt and incised valley traps are dominated by oil and gas. The reservoir forming condition is good on the structural slope break zone.