Abstract: The origin and evolution of hydrodynamics in petroliferous sedimentary basins was a synthetical reflection on pore fluids of the climate,drainage distribution,tectonics,sedimentary environments and their evolution. There were closely relationships among the origin and evolution of hydrodynamics,and the migration and accumulation of petroleum. Generally speaking,a petroliferous sedimentary basin experienced multi-stage hydrogeological cycles,which decided that,in an independent hydrodynamic system,the oil-gas migrated by stages,with a stair-shaped or ringlike distribution. Centrifugal flow caused by mudstone-compacted water was a main dynamic force that induced the petroleum migration and accumulation in sedimentary basins. Paleohydrogeologic cycles and centrifugal flow stages induced the wave type migration and step-annular distribution of oil and gas in an independent hydrodynamic system. Several hydrodynamic systems would be developed in such basins with several depressions,which would induced several annular distribution of oil and gas in such basins. As a sedimentary basin with poly-sag,the oil-gas consisted of,generally,composite poly-ringlike distribution.