TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The outer layer of polyethylene glycol terephthalate and polyester co-extruded layer is composite film formed by co-extrusion of polyethylene terephthalate and polybutylene terephthalate, polyethylene terephthalate, polyethylene glycol naphthalate and/or liquid crystal polymer. The outer layer is added with modified particles, where the modified particle is inorganic nanoparticle and the amount of inorganic nanoparticle accounts for 1-20% of total mass of co-extruded outer layer. The outer layer is coated with an UV protection layer. The UV protective layer contains fluoropolymer, epoxyacrylate polymer, polyurethane acrylate and/or polyester acrylate. The fluoropolymer is terpolymer of polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene, hexafluoropropylene and/or vinylidene fluoride. The inorganic nanoparticle is nanoscale silicate, calcium carbonate, silica, titania and/or montmorillonite. The intermediate adhesive layer is adhesive layer, where the adhesive layer comprises a main agent, a curing agent and a solvent, the main agent is polyurethane, unsaturated polyester, silicone, polyimide, bismaleimide, allyl resin, furan resin, amino resin and/or alkyd resin, and the solvent is ethyl acetate, butyl acetate, acetone and/or methyl ethyl ketone. The inner layer of polyethylene and olefin polymer co-extruded layer is co-extruded composite film formed by polyethylene and ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polypropylene, ethylene-octene copolymer and/or norbornene copolymer. The polyethylene is linear low density polyethylene, low density polyethylene, medium density polyethylene, high density polyethylene and/or ultra high molecular weight polyethylene. The norbornene copolymer is processed with silicone coupling agent, where the norbornene copolymer is copolymer of norbornene and olefin and/or acrylate compound. The olefin compound is ethylene, propylene, butylene, butadiene, isoprene and/or octene. The acrylate is methyl acrylate, ethyl acrylate, 2-methyl methacrylate and/or 2-ethyl methacrylate. The thickness of outer layer is 100-800 mu m, intermediate adhesive layer is 5-50 mu m and inner layer is 50-500 mu m.