A kind of petroleum sulfonate (PS) was synthesized by distillate of Shengli crude oil and Salt tolerant properties and interfacial tension of blend systems of petroleum sulfonate and different carbon chain aliphatic alcohol ether sulfonate (AnESO, EO=3，n=1214,16,18) were investigated. Results showed that: (1) the PS solutions had very poor salt tolerance. Precipitation occurred when the sodium chloride content reached 30g/L, or calcium chloride content reached 0.15g/L. The interfacial tension between crude oil and surfactant solutions is higher than 10-1 mN?m-1. (2) Salt tolerant ability was enhanced for blend systems with ω(PS) :ω(AnESO) = 9:1 than PS. Salt tolerant (sodium chloride) could reach 70g/L, 60g/L and 80g/L, while for calcium chloride 2g/L, 1.8g/L and 2.4g/L, respectively. (3) Interfacial tension of blend systems of PS/A18ESO could reach 10-2 mN?m-1 range under the optimal salinity.