Abstract: In order to make oil production in maximum degree within the limited life span of offshore equipments, tertiary oil production with early polymer flooding has been suggested, and therefore, the pilot testing of which has been carried out in Jinzhou 9-3, Suizhong 36-1 and Lvda 10-1. Take Bohai Jinzhou 9-3 oilfield as an example in this paper, based on dynamic analysis of polymer flooding, the production properties of early polymer flooding in high water cut period has been studied, providing theoretical guidance and application experiences for the implementation of enhanced oil recovery technology, for optimized adjustment strategies and for tertiary oil production of the similar oilfields as well.