Abstract: Aimed to enhance oil recovery in Jinzhou Oilfield, indoor experiment are carried out on α-olefine sulphonate surfactant HDS and SNF polymer combination flooding.Some experiments as interfacial tension characteristics, HDS absorption loss, SP system viscosity retention and core flooding experiments are carried out based on the reservoir condition and current recovery status.The experiment results show the HDS surfactant and the SP combination system steadily reduced oil/water interfacial tension obviously below 10^-3 mN/m, HDS absorption loss (0.2% HDS loss less than 2.0 mg/g) was small, system viscosity retention rate (≥ 90%) was high and greatly enhanced oil recovery up to 20% compared with water flooding. Those experiments proved HDS surfactant is the superior agent that suitable for Jinzhou Oilfield, the alkalifree SP flooding technology has brig ht future that can enhance the oil recovery greatly.