By using polyvinyl alcohol as disperse agent, Au-and Pt powders were prepared respectively by reduction of chlorauric acid to Au with ascorbic acid and reduction of chloroplatinate to Pt with hydrazine. 用聚乙烯醇作分散剂,抗坏血酸作还原剂,将氯金酸还原到Au;以水合肼作还原剂,将氯铂酸盐还原到Pt,分别制备了Au粉和Pt粉;