The present invention relates to a functional composition for surface modification. The composition for surface modification, according to the present invention, comprises functional components having functional groups, which can be covalently bound to cysteine residues in proteins of hair, skin, fingernails or toenails, hide, or fiber, to form covalent bonds without damaging the hair, skin, fingernails or toenails, hide, or fiber, thereby remarkably improving the effects of the functional components, thus providing a desired surface modification effect semi-permanently.
