Qingdong sag is a Cenozoic faulted basin, whose east boundary is defined by the west branch of Tanlu fault zone. Affected by the strike slip displacement of the boundary fault and the regional tectonic stress field, there are many structures showing obvious strike slip characteristics in Qingdong sag, such as the large strike slip boundary faults, the antiformal negative flower structure and compresso-shear folded structure. After three fault-subsidence periods and two reversion stages, these structures are mostly compound structures. The strike slip structures have great influences on the thermal evolution of hydrocarbon source rock, the formation of structural trap and the migration and accumulation of petroleum in Qingdong sag. Three patterns of petroleum migration and accumulation, which control the abundance and distribution of petroleum reservoirs, are recognized in Qingdong sag.