In accordance with the features of coastal buildings, the design takes "wave" as the element, extracts and geometrically deduces the wave lines in an abstract way, thus forming an elegant, stacked and extended horizontal and transverse roof. The roof adopts slab concrete structure to highlight the thin and flexible slab body. The thin roof, undulating in different directions, covers an abundant interior space that flows between upper and lower, inside and outside. The space under the roof has enough shadow and can provide shelter for the public.