For improving the flow-turning ability of hydrophobically associating polymer/surfactant binary combination and getting a good effect of enhancing oil recovery in Dagang oilfield，the effect of polymer and surfactant concentration，core permeability and injection water descaling on the viscosity and seepage characteristics of hydrophobically associating polymer and binary combination system was studied. The results showed that the viscosity of polymer solution and binary combination system increased with the increase of polymer concentration. The critical association concentration of hydrophobically associating polymer was 1—2 g/L. A small amount of surfactant could enhance the association of hydrophobic associated polymer and improve the viscosity and seepage resistance of binary combination system. The higher permeability of core，the lower resistance coefficient and residual resistance coefficient of binary system was. The polymer and binary combination system configured by descaling softened water had the biggest viscosity. Besides，the smaller polymer concentration，the more obvious thickening effect of softening water was. The polymer and binary combination system configured by softened water with scale had the biggest resistance coefficient and residual resistance coefficient，the highest injection pressure and the best flow-turning ability.