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The dynamic interfacial tension between Gudao heavy oil and a complex system consisting of hydroxysulfobetaine and hydrolyzed polyacrylamide are measured.The effects of surfactant concentration, HPAM concentration, salinity and adsorption loss on the interfacial tension of complex system were investigated.It has been found that the complex system can reduce the oil/water IFT to ultra-low and the minimum IFT is 6× 10-4mN/m.