Abstract: The Performance of one surfactant for thermal recovery was evaluated by experiment. The interfacial tension (IFT) of crude oil from Gudao third block in LC solution is 10^-1mN/m, ultra-low IFT can be further achieved when NaOH was added. Static adsorption result showed that the maximum adsorption of LC on quartz sand at 70℃ is 3.6185mg/g. Besides, LC has good temperature resistance at 150℃; even at 200℃, its half-time is longer than 15 days. When LC solution and crude oil were mixed in mass ratio of 3/7 and 2/8 at 70℃, oil viscosity can be dramatically decreased by more than 85%. Heavy oil dynamic flooding tests at 150℃ indicated that oil recovery raises with the increase of LC concentration, but the concentration of surfactant should not be too high in consideration of its cost. When 0.5wt% NaOH was compounded with 0.5wt% LC, oil recovery of hot water/alkali/surfactant flooding is 10.85% higher than that of hot water/alkali flooding, exhibiting good synergistic effect between NaOH and LC. It can be concluded that LC is a promising thermal additive in thermal recovery of heavy oil.