In order to improve the oil displacement efficiency of chemical flooding in Jidong oilfield，new double anionic surfactants containing a hydrophobic chain and two hydrophilic groups were synthesized with alkyl amine，ethyl acrylate，sodium chloroacetate or sodium 3-bromopropylsulfonate. The structures of the synthesized products were characterized by infrared spectroscopy，thermogravimetric analysis，pH buffer test，and so on. The effect of double anionic surfactant on the interfacial tension between Jidong crude oil and water，and on oil displacement efficiency were studied. The results showed that synthetic surfactants SS-1 and SS-3 contained dicarboxylic acid groups，while SS-2 and SS-4 contained a carboxyl group and a sulfonic acid functional group. Four surfactants could all reduce the interfacial tension between crude oil and water. The interfacial tension reduced to 10^-2—10^-3 mN/m magnitude in the absence of alkali，and that decreased to 10^-4—10^-3 mN/m by SS-1 under weak alkali condition（1% Na₂CO₃）. Weak alkali condition was favorable to improve the oil displacement efficiency of surfactant. The recovery ratio of SS-1 could increase to 13%—15% after water flooding under weak alkali condition. SS-1 could be used as the flooding surfactant for the tertiary oil recovery of shallow oil reservoir in Jidong oilfield.