The high-pressure phase behavior of coating-solvent-supercritical or sub-critical carbon dioxide system was investigated experimentally. The coating matrix used was 108-acrylic resin at concentration ranging from 10% to 50% (by mass) in mixtures with n-butyl acetate. The experiments were conducted in a high-pressure view cell for temperatures from 35℃ to 65℃ and for pressures from 3.0 MPa to 8.0 MPa. The effect of temperature, pressure and content of every component on the phase behavior of the systems was observed. Finally, the ternary phase diagram for resin-solvent-CO2 was plotted.