Six antioxidative compounds in the aerial parts of Potentilla fragarioides were isolated by a bioassay guided purification using a DPPH free radical. They were identified as (+)-catechin, isoquercitrin, quercitrin, $quercetin-3-O-{eta}-D-glucopyranosyl-{eta}-D-xylopyranoside$, caffeic acid, and 4-O-caffeoyl-L-threonic acid on the basis of $^{1}H$ and $^{13}C-NMR$ and MS data. The DPPH radical scavenging activity of five compounds $(RC_{50}:;7.5{sim}10.5;{mu}g)$ except for quercitrin $(16;{mu}g)$ was more effective than those of ${alpha}-tocopherol$ $(12;{mu}g)$ and BHA $(14;{mu}g)$.