The concentrations of naphthalene in CO2-rich phase for the ternary system "CO2 + [bmim] [PF6] + naphthalene" were determined by a static method with online high-pressure ultraviolet detection, for the naphthalene molality in the liquid phase ranging from 0.0169 to 0.378 mol/kg, and within temperature and pressure ranges of 313-333 K and 8-20 MPa. It was found that naphthalene concentration in CO2-rich phase decreased regularly with decreasing naphthalene molality in the liquid phase. All the solubility data were correlated by Chrastil's association model and the mean relative deviation was 14.9%. (c) 2006 Elsevier B.V. All rights reserved.