The solubility of propyl p-hydroxybenzoate was measured in the supercritical CO_2 at temperature 308.15 K and pressures from 8.0 to 23.0 MPa by using a flow-type phase equilibrium apparatus with pure and mixed cosolvents, such as acetone and cyclohexane+acetone (molar ratio 1∶1) at the mole fractions of 0.01~0.04. The cosolvent effect was analyzed. The measured solubilities in SC-CO_2 with cosolvents were correlated by the expanded liquid model. And the result indicates that the estimated value is well fitt...