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The influences of an anionic-nonionic composite surfactant and petroleum sulfonate,used in surfactant-polymer flooding in Shengli Gudong oilfield,East China,on the interfacial properties of Gudong crude model oil and synthetic formation water was studied by measuring interfacial tension,interfacial viscoelasticity and Zeta potential.The influence of the surfactants on the stability of Gudong water-in-oil(W/O)and oil-in-water(O/W)emulsions was evaluated by separating water from the W/O emulsion and residual oil in the aqueous phase of the O/W emulsion respectively.The results showed that the two kinds of surfactants,namely anionic-nonionic composite surfactant and petroleum sulfonate,are both able to decrease the interfacial tension between the oil phase and the aqueous phase and increase the surface potential of the oil droplets dispersed in the O/W emulsion,which can enhance the stability of the W/O and O/W crude oil emulsions.Compared with petroleum sulfonate,the anionic-nonionic composite surfactant is more interfacially active and able to enhance the strength of the interfacial film between oil and water,hence enhance the stability of the W/O and O/W emulsions more effectively.