:The injection mode of chemical flooding have a significant role in guiding reservoir to enhance recovery rate. In order to determine the best injection mode of chemical flooding for west areas in dagang oilfield reservoir to improve the development effect, this paper has designed respectively seven kinds of injection modes in indoor flow experiments for homogeneous and heterogeneous porous medium model respectively. The results show that : Compared with polymer flooding and the surface active agent flooding, polymer/surfactant Binary Flooding has more larger role in enhance recovery rate;The enhance recovery rate of polymer/surfactant binary flooding is 18.1% in the homogeneous porous medium model.The enhance recovery rate of polymer/surfactant binary flooding is 21.93% n the heterogeneous porous medium model.The difference between them is 3.83%;Based on homogeneous and heterogeneous porous medium model, polymer/surfactant binary flooding has the largest role in enhance recovery rate; Compared with homogeneous porous medium model, polymer/surfactant binary flooding could play its more effectively role in enhance recovery rate for the heterogeneous porous medium model;Alternating injection mode with small plug polymers and surface active agent could effectively reduce the injection pressure;As adjustment measures to enhance recovery rate for west areas in dagang oilfield reservoir, this paper chose polymer/surfactant binary flooding firstly , then chose the alternating injection mode with small plug polymer and surface active agent secondly .