The lay-in ceiling is composed of decorative panel, open keel and upper light steel main keel and related accessories. The board surface is flat, the lines are crisp, and the three-dimensional sense is stronger. Each board can be disassembled and assembled independently, which is convenient for construction, maintenance and cleaning. When designing, the width of the keel can be customized and the combination of lighting and ventilation accessories can be used to create different line effects.