Abstract: Hair keratins from a total of 50 individuals belonging to 10 families and 18 species have been analyzed by means of SDS-polyacrylamide gel electrophoresis (SDS-PAGE).Animal hairs differ mainly from human hair in the range of low molecular weight components (<18500 dalton).There are obviously differences among various animal species.Ailuropode melanoleuca hair is greatly different from Ailurus fulgens hair and Selenarctos thibetanus hair.Based on this observation,the paper describes a difference of keratin component from animal hairs,which provides useful information for hair comparision in animal taxonomy.