Adopting PET material of the latest generation in accordance with international test standard as ASTM. The surface procedured special treatment for protection from scratch and long solidation up to 4H, overally protect the screen. Dustproof, waterproof, anti-strong light and UV which keep the LCD screen from hurting. Glue liquid as silicon resin compound which easily stick and be used repeatedly, without debris. Without erosion to screen surface. Adopts dustproof procedure of center computer-control, suitable for usage of LCD screen of other fields.