Silk protein can hydrolyze into the intermediate, which has relatively small molecular weight and can pass semi-endosis. This intermediate is called silk peptide, and can be condensed and desiccated into powder of silk peptide. The silk peptide in large molecular weight has a good membranate character, which gives the hair natural gloss and elasticity to let the hair easy dressing and making up. The silk peptide of low molecular weight is easy to be absorbed by skin, and to be permeated to the inner of hair to provide the necessary nurture for its normal metabolism, as well as to repair the injured hair.