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Vapor-liquid equilibrium data of the supercritical carbon dioxide-used lubricated oil system were measured at 308, 313, 318 and 323K in the pressure range of 9~18 MPa.The measurements were carried out in a cylindrical autoclave with a movable piston and an observed window.The changes of phase were also studied.The pressure at the point of being homogeneous phase and the solubility in two phases at different conditions was measured.The research showed that the pressure at the point of being homogeneous phase increased with the increasing of temperature.The solubility under the experimental conditions was associated with Chrastil equation to obtain equation.The calculation results showed that fitting accuracy is good between theory calculation and experimental data.This research can provide the theory basis for industrialization design and operating conditions analysis of the extraction of used lubricated oil in supercritical carbon dioxide.