Based on the high-pressure phase behavior of polymer-solvent-supercritical carbon dioxide systems, a new process of spraying coatings was introduced. The thermodynamic properties, atomization mechanism, spray conditions were discussed in detail. The miscibility of supercritical carbon dioxide with solutions of polymer and organic solvent was dependent upon the carbon dioxide level, temperature, pressure, polymer level, and compatibility of the polymer with the solvent. The research of the ternary phase dia...