Using acetylacetone copper as precursor,H2 and O2 are used as the explosive source,and Cu @ C core/shell nanoparticles with the grain size below 10nm are synthesized by the method of gaseous detonation.Under the condition of satisfying the negative oxygen balance,the influence of hydrogen,oxygen ratio toward the generated carbon-coated Cu nanoparticles can be explored by varying the amount of explosive gas.XRD,Raman spectroscopy and TEM are adopted to test the generated products,and found that the best result can be achieved when the hydrogen oxygen ratio is close to 2: 1.This conclusion has provided reference for the selection of explosive gas ratio of carbon-coated Cu nanoparticles that synthesized by gaseous detonation method.