Abstract：The Winsor phase diagram and the optimum solubilization parameter curves are used to compare the oil solubilization property among microemulsion systems of four kinds of common anionic surfactants, including sodium dodecyl sulfate (SDS), sodium lauryl sulfonate (SLS), sodium dodecyl benzene sulfonate(SDBS) and sodium alcohol ether sulphate (AES). The order of their solubilization ability is SDBS＞AES＞SDS＞SLS. Mixed surfactants of SDS-octadecyl trimethyl ammonium chloride (OTAC) and SLS-OTAC were used to forming microemulsion systems, respectively. When the optimal mixing ratio was reached, the optimum solubilization parameter(SP*) of SDS/OTAC and SLS/OTAC systems increased by 150% and 170% and the optimum salinity decreased by 91% and 95% respectively when compared with the single SDS and SLS microemulsion systems. It was also found that, when the temperature changes from 20℃ to 50℃, the optimum solubilization parameter of the SDS-OTAC microemulsion system reduced slightly and the optimum salinity only increased slightly. However, when the temperature exceeded 50℃, the optimum solubilization parameter decreased and the optimum salinity increased rapidly.