The critical temperature and pressure of fluororubber-ethyl acetate-CO₂ ternary system are investigated by the static visual method at constant volume. On the basis of the results, NTO based polymer bonded explosive (PBX) is prepared by supercritical fluid anti-solvent method. The feasibility of the technique and the technology is validated by means of the sample component analysis,performance testing, absorbance testing, infrared spectra and SEM etc.