Resin and asphaltene were separated from Daqing crude oil and were dissolved in decane1 The interfacial viscoelasticity was investigated by applying the cont rolled stress model of oscillatory ring interfacial rheometer CIR-100.The effects of resin,asphaltene contents in decane,pH values,and demulsifiers in aqueous phase on interfacial viscoelasticity were studied1 It was shown the interfacial viscoelasticity of water/decane containing asphaltenes or resins is of the order of 4 higher than that of water/decane,and the interfacial viscoelasticity increased with increasing resin and asphaltene concent rations in decane.When the pH value in aqueous phase was about 7,interfacial elasticity approached a maximum1 Demulsifers in aqueous phase could obviously reduce interfacial viscoelasticity and interfacial tension.