Abstract: Remaining oil recovery of offshore polymer flooding oilfield is closely related to the distribution law and main controlling factors of remaining oil. However, the remaining oil core displacement experiment cannot get a clear understanding of the remaining oil distribution. By using the heterogeneous microscopic pore model, the distribution pattern of remaining oil in Bohai J oilfield under the different displacement media and different displacement velocities, as well as the influence of different displace ment media on the main remaining oil distribution pattern were studied. The experimental results showed that remaining oil distribution effected by driving velocity significantly under the same driving medium, polymer and surfactant driving system is the most effective under the same driving velocity.