The surface hardness of polycarbonate and acrylic sheet has B to 2H pencil hardness. The demages during handling and using of these products give optical problems on itself. Because this kind of problems especially on surface bring out the anti scratch coating. It increase the surface hardness from Bto 2H on polycarbonate sheet and from 2H to 6H on acrylic sheet. It also increases the transmission rate of visible light from 89~ 90.5% to 90.5~92%. Anti-scratch coating on polycarbonate sheet makes the chemical resistance of the sheet. This coating has been used for commercial, militery field which need to protect the plastic surface not only from scratch but also chemical solvents.