Nano silver powder was synthesized from Ag/MgO composite powder fabricated by spray pyrolysis. Effects of furnace set temperature, concentration and molar ratio of mixed solution, flux of carrier gas on morphology and particle size distribution of silver powder, were investigated. Results showed that with low concentration and molar ratio of mixed solution, low furnace set temperature and high flux of carrier gas, nano silver powder about 48 nm with narrow particle size distribution was fabricated. (C) 2008 Elsevier B.V. All rights reserved.