Strictly control the current density of anodizing. As the current density increases, the color of the oxide film gradually becomes darker, and the thickness of the film layer first becomes thicker and then thinner. The reason is that the current density increases, and the pores of the Aluminum anodized honeycomb panel are enlarged, which is easy to color; the current density decreases. Small, the growth rate of the film is reduced, and the film is dense, so as the current density increases, the color of the oxide film gradually darkens. The aluminum foil adopts roll forming technology to complete the forming of the front and back skins; the honeycomb aluminum skin has small holes, so that the gas in the plate can flow freely; the slidable mounting buckle system will not cause structural deformation during thermal expansion and contraction, so it can ensure Very high flatness.