The solubility of polymer-supercritical CO2 binary systems was studied, and the effects of co-solvent on the solubility were discussed. The polymers used in this experiment were from commercial coating resins, and AR toluene and cyclohexane produced domestically were used as co-solvent. The results show that the addition of co-solvent increases the solubility remarkably (see Tab. 1). The high-pressure phase behavior of poly- mer- solvent-supercritical CO2 ternary systems was also investigated experimentally...