In recent years, it has many advantages, such as high bearing capacity, good overall performance, good bearing capacity, high precision, surface roughness, easy locking and so on. There are many kinds of optional and easy matching lighting system. Floor design according to a variety of installation of the system, can be easily assembled in the field, no welding. Attic shelf system in the field of auto parts, auto 4S shop, light industry, electronics and other industries have more applications.