The decorative structure of direct open caisson ceiling refers to the structure that the wooden grille or light steel grille is directly fixed at the bottom of the floor, the grille spacing is determined according to the design specifications of open caisson, and then the decorative materials such as gypsum board, plaster line, batten and wood line are fixed on the grille surface. This decorative structure is simple, the depth of open caisson can be flexibly adjusted according to the height of space, which can enrich the indoor top floor and enhance the indoor space effect.

The decorative structure of structural ceiling refers to the decorative form of ground, roof structure and pipeline facilities that directly expose indoor space. In the indoor space decoration of modern buildings, reinforced concrete floors, grid structures, arched structures and piping equipment are often exposed. The visual effects formed by the morphological characteristics of building structures and piping equipment are fully utilized to achieve the purpose of decoration, aiming at emphasizing the structural beauty of buildings and facilities.

Structural ceiling decoration structure usually uses floor or roof structural components and pipeline facilities as ceiling decoration components, and its forms are consistent with floor and roof structures, mainly including grid structure, arch structure, suspended cable structure, well-shaped beam-slab structure and so on. It is often used to adjust the color and material of structures and pipeline surfaces to achieve the purpose of decoration.