Abstract: Ⅱtype reservoir distributed polymeric compound in the west of northern one two line of Daqing oilfield Sazhong developing area is set of continental fades river -delta clastic rock deposition. Comparing major reservoir, there is rather uniform permeability, pore throat radius and effective thickness inⅡtype reservoir. Therefore it's more applicable to adopt middle molecular weight polymeric compound with large width index in molecular distribution for oil driving, which can improve polymeric compound oil driving effect Laboratory core simulated experiment testified that it can enhance 1. 2% collection rate comparing ordinary middle molecular weight polymeric compound by adopting middle molecular weight polymeric compound with 23 width index in molecular distribution forⅡtype reservoir polymeric compound oil driving.