Surface treatment: (1) coating hardness technical standards: film hardness: Zhonghua pencil ≥2H passing the test; Gloss determination: surface brightness of more than 90%; film thickness: electromagnetic induction average film thickness was measured by four-point thickness of 60um ~ 70um; coating adhesion: cross-hatch test, 100% no peeling, reaching 0 standard. Corrosion test: 5% NaC1 / cm2 frontal impact, the film no cracks, wrinkles and spalling. (2) spray materials used Akzo Nobel. Long-China limited factory production of thermosetting powder coatings (high quality eco-friendly materials), configure the main chemical raw materials and components provided by the DuPont plant, belonging to the world's most advanced steel coatings. (3) spray equipment: using the most advanced automatic spray pre-treatment production line, automatic degreasing, washing, table transfer, phosphate, and other features to improve the adhesion of coating products to enhance product corrosion resistance. Swiss gold thread factory introduce automatic dusting equipment, production process using computer-controlled, automatic spray and recovery, thereby improving the quality of the paint, changing the appearance of the manual operation of various problems. We can say that the surface treatment process as a file loaded with books, the choice of coating materials, through processing of the most advanced spray equipment, its quality to reach the world advanced level, better than similar products at home and abroad. (4) products used standard parts and fasteners by oxidation or galvanized to ensure parts quality. (5) the product of the parts, assemblies require a smooth surface, smooth, without sharp corners and projections, consistent, uniform and smooth surface spray color, no cracks, scars.