Natural marble slab is a kind of high decorative material, which is mainly used in buildings with high requirements for architectural decoration, such as memorial buildings, hotels, exhibition halls, theaters, shopping malls, libraries, airports, stations and other large public buildings, such as indoor walls, cylinders, floors, stair treads and other decorative materials, and can also be used for stair railings, service desks, gables, dados, windowsills, skirting boards and so on.