Application for Cu nanopowders: 1. Nano copper has high surface area, large number of surface-active centers , in the metallurgical and petrochemical industry is an excellent catalyst. 2. In the hydrogenation and dehydrogenation reactions in polymers, nano copper as catalyst has high activity and selectivity in acetylene polymerization process for the production of conductive fiber, copper nanoparticles are very effective catalysts. 3. In the process of purification of automobile exhaust gas, a catalyst of copper nanoparticles as the noble metal may be used partially in place of platinum and ruthenium, making the conversion of carbon monoxide to carbon dioxide toxicity, nitrogen monoxide into nitrogen dioxide. Other uses: 1. In terms of conductive material, copper nanoparticles are coated conductor, a dielectric insulator surface, used as a conductive coating and raw materials, electrode materials such as conductive composites. 2. In the field of engineering structural materials, nano-copper powder was prepared by high electrical conductivity, the basic raw material of high strength nanocrystalline copper. 3. Copper nanoparticles have good adsorption properties, can be used as a binder additive in bio-engineering, but also can be used as bacterial filter.