以Cu SO4?5H2O为原料、聚乙烯吡咯烷酮为分散剂、葡萄糖和二氧化硫脲为还原剂,采用液相两步还原法制备分散性较好的球形纳米铜粉,考察了预还原步骤、二氧化硫脲与铜离子浓度配比、反应温度和反应时间对铜粉粒度、分散性和形貌的影响,表征了铜粉的特性.结果表明,较优的制备条件为:二氧化硫脲与硫酸铜溶液浓度比2:1、反应温度75℃、反应时间15 min,该条件下所制产品为粒径20～100 nm的类球形铜粉. Using CuSO4-5H2O as raw material, polyvinylpyrrolidone as dispersant, glucose and thiourea dioxide as reductant, the dispersive spherical nano copper powder was prepared by liquid two-step reduction method. The effects of pre-reduction step, thiourea dioxide and Copper ion concentration ratio, reaction temperature and reaction time on the copper particle size, dispersion and morphology, characterization of the characteristics of copper powder.The results show that the optimal preparation conditions: the concentration of thiourea dioxide and copper sulfate concentration ratio of 2 : 1, the reaction temperature is 75 ℃, the reaction time is 15 min, and the product under this condition is spheroidal copper powder with particle size of 20-100 nm.