With the oil-water interfacial tension as the property evaluation index, the binary combination flooding composed of organic alkali ethanolamine(MEA)and petroleum sulfonatewas optimized as follows, 0.30% SLPS+0.30% MEA. On this basis, the interfacial ability, salt resistance, temperature resistance, emulsification and oil displacing properties of the optimized binary combination flooding MEA/SLPS system was evaluated by comparing that of common used binary combination flooding system——inorganic alkali/surfa...