Grafting the acrylate monomers to the enamel surface with the triggering of the ultraviolet(UV) radiation grafting polymerization technology provides the basis for the introduction of enamel surface enamel protein molecules.Well mix the double-meng early canines and acrylic enamel powder,then put it in the pure oxygen environment for the reaction.IR spectra showed that the carboxyl group had been grafted to the enamel surface.Spectrophotometry was used to measure the density of the graft.