Abstract: The progress in the research of preparing ultrafine copper powder by chemical reduction method is systematically summarized, with the highlight on the effect of reductive agents on the process, such as formaldehyde, ascorbic acid, sodium hypophosphite, potassium borohydride and hydrazine hydrate. Meanwhile, the factors influencing the nucleation and growth mechanism in the process are described briefly, including the solution pH value, temperature, reactants concentration, dispersant and protector. The present challenges in the process research are pointed out and the future research orientation is proposed.

Key words: Ultrafine copper powder, Chemical reduction method, Preparation, Progress