Abstract: The faults，san bodies and unconformities，which are basic elements of hydrocarbon migration in Liaodong Bay,form three kinds of transferring systems by mating.The oil reservoirs whose hydrocarbon migrated vertically along the faults often have multiple oil beds over lapped near the faults，and the faults are dominated by syndepositional characteristic.The oil reservoirs whose hydrocarbon migrates mainly along the connected sand bodies and faults mainly take shape in the highly porous and high permeable beds nearby the sides of faults， the key factors affecting transfering capability are special distribution and mating of faults and sand bodies.Hydrocarbon through the unconformity belts and sand bodies can migrate in a long distance and forms stratigraphic reservoirs，affecting transferring capability are porosity and lateral connectedness.The oilgas transferring systems determine types and distribution of reservoirs.In the north of Liaodong Bay,unconformities are common，which are favorable location for lithologic hydrocarbon reservoirs.In the middlesouth of Liaodong Bay，faults and sand bodes are abundance in number，which are favorable location for of structural hydrocarbon reservoirs.

Key words: Liaodong Bay, transfering systems, fault, sand body, unconformity surface