TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The solvent used in the manufacture of multilayer film is acetone, methyl ethyl ketone, dimethylformamide or dimethylacetamide.    TECHNOLOGY FOCUS - POLYMERS - Preferred Process: The manufacture of multilayer film further involves drying primer layer and fluorinated-polymer coating layer after coating. Preferred Composition: The primer layer includes fluorinated-polymer having main chain skeleton, and curing agent. The primer has functional group chosen from carboxyl group, sulfonic acid group, aziridine group, acid anhydride group, amine group, isocyanate radical, cyanuramide group, epoxy group, hydroxy group, ester functional group, carbamate functional group, amide group, urea group, imide group, phosphate group, oxazoline group, cyano group, cyanate group and imine group. The fluorinated-polymer has amorphous area. The fluorinated-polymer is chosen from vinylidene fluoride, vinyl fluoride, tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene, trifluoroethylene, hexafluoroisobutylene, (perfluorobutyl)ethylene, perfluoromethylvinylether, perfluoro(ethylvinylether), perfluoropropylvinylether, perfluorohexylvinylether, perfluoro-2,2-dimethyl-1,3-dioxole, perfluoro-2-methylene-4-methyl-1,3-dioxolan and/or their homopolymer and copolymer, preferably homopolymer or copolymer of vinylidene fluoride or vinyl fluoride. The comonomer of fluorinated-polymer is polyvinylidene fluoride, hexafluoropropylene, chlorotrifluoroethylene, tetrafluoroethylene, trifluoroethylene, hexafluoroisobutylene, perfluorobutylethyene, perfluoromethylvinylether, perfluorohexylvinylether, perfluoro-2,2-dimethyl-1,3-dioxole and perfluoro-2-methylene-4-methyl-1,3-dioxolan. The content of the comonomer is 0.5-50 wt.% with respect to total content of copolymer. The fluorinated-polymer coating layer further contains pigment, filler, ultraviolet stabilizer, thermal stabilizer, dispersing agent and barrier particles. Preferred Properties: The thickness of the primer layer, fluorinated-polymer coating layer and substrate is 10-5000 nm, 3-50 mu m and 50-500 mu m, respectively. The degree of crystallinity of the fluorinated-polymer is 60% or less. The fluorinated polymer has weight average molecular weight of 50000-1000000, and melting point of 80-175 degrees C.