TECHNOLOGY FOCUS - POLYMERS - Preferred Composition: The content of crystalline fluorine-containing polymer is 10-55%. The fluoropolymer is chosen from vinylidene fluoride, vinyl fluoride, tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene, hexafluoroisobutylene, perfluorobutylethylene, perfluoromethylvinylether, perfluoroethyl vinyl ether, perfluoropropyl vinyl ether, perfluorohexyl vinyl ether, perfluoro-2,2-dimethyl-1,3-dioxole and perfluoro-2-methylene-4-methyl-1,3-dioxolan. The water-dispersible binder is chosen from polyurethane resin, polyacrylic resin, polyurea resin, polyamide resin, polyolefin resin, polyvinylacetate resin, polyether resin, alkyd resin, urethane-acrylate copolymer, vinyl urethane copolymer, ethylene-vinyl alcohol copolymer, silicone-acryl-urethane copolymer, ethylene-vinylacetate copolymer and acryl-modified polyester resin. The content of water-dispersible binder is 0.1-50 pts. wt. The cross-linking agent is chosen from isocyanate-type resin, oxazoline-type resin, melamine resin, epoxy-type resin and carbodiimide-based resin. The content of cross-linking agent is 0.1-50 pts. wt. The water-dispersible composition further comprises surfactant. The surfactant is chosen from 0.1-100 pts. wt. The substrate comprises macromolecular film chosen from acrylic film, polyolefin film, polyamide film, polyurethane film and polyester film. The polyester film is chosen from polyethylene terephthalate film and polybutylene terephthalate film. The resin layer comprises water-dispersible composition. Preferred Process: The in-line coating process is carried out using water-dispersible composition containing crystallization fluoropolymer, pigment, water-dispersible binder and water. Preferred Properties: The weight-average molecular weight of fluoropolymer is 50000-1000000. The melting point of fluoropolymer is 80-175 degrees C. The average particle diameter of fluoropolymer is 50 mm or less. The thickness of substrate is 50-500 mm. The thickness of the resin layer is 0.5-30 mm.