The key parameters and their values in the worldwide EOR technological limit for polymer flooding are compared in the paper. The main influence factors for polymer flooding are analyzed, and the distribution pattern of reservoir parameters in oilfields that have successfully applied polymer flooding is found. By considering the technical advancement and the application of polymer flooding,the new technological limits and parameter gradation series are established by using area percentage function of parameter distribution.The new technological limits for polymer flooding are used to evaluate the applicability of polymer flooding in 4 different reservoirs.The result shows that the new technological limits and parameter gradation series are applicable for the field research.