The surface of copper powers was plated with silver. The silver-coated copper power was characterized and its performances were tested by XRD,DLS and TG.The influence factors of conductivity, antioxidativity and its particle size were analyzed. The results show that silver-coated copper powders are prepared by liquid chemical reduction methed, which glucose as prereductant and formaldehyde as reductant in ethylene glycol system. The mole ratio of copper and silver is 2:1. Silver-coated copper powders exhibit excellent conductivity and antioxidativity.