Several methods of preparing nanocomposites energetic materials in liquid phase by using sol-gel chemistry,spray route,precipitation and freeze-drying are reviewed. Metal-oxide-based nanocomposites energetic materials are prepared mainly by sol-gel,and the preparation of Fe₂O₃/Al nanocomposites is illustrated. Spray route including spray drying and Rapid Expansion of Supercritical Solution (RESS) instead of solvent with CO₂ supercritical fluids are introduced,mainly by which nanocomposites with energetic materials and nanostructured metal particles are prepared. Precipitation and Compressed Fluid Antisolvent (PCA) instead of precipitation reagent with CO₂ supercritical fluids are also given. Composites with inorganic oxidizer and nanostructured metal particles are prepared by freeze-drying,and NH₄ClO₄/Al nanocomposites is illustrated.