The submicron HMX/ FPM₂₆₀₂ composite explosive was prepared by solution-aqueous suspension technology with ultrasound and supercritical fluids antisolvent (SAS) coating technology, and were analyzed by component analysis, scanning electron microscope (SEM) and Fourier transformation infrared spectrometer (FT-IR). Its detonation performance was tested as well. Results indicate that the solution-aqueous suspension technology is not suitable for preparation ultra-fine composite explosive, whereas SAS technology has not any pollution.