The steep slope zone is an important structural belt for hydrocarbon exploration in half graben-like sag, and the structural-lithologic composite traps are developed in this zone. These traps are important prospecting areas. However, it is very complex in structure, sedimentary facies and control factors on distribution of the structural-lithologic composite traps in this zone. Taking Shinan steep slope of Bozhong sag as an example, this paper focuses on the genesis and distribution regularity of the structural-lithologic composite traps in the steep slope zone. There are four types of structural-lithologic composite traps developing in the Shinan steep slope zone, and they are updip punch-out trap, downdip punch-out trap, lateral punch-out trap and physical property sealing trap. The thinking of the structural-lithologic composite trap exploration should be built in the early exploration phase in the Shinan steep slope zone.