The closed floor deck is the latest new technology product introduced by our company. It is a more advanced composite floor deck system. It has been proved by experiments that it has stronger bearing capacity and shear resistance than other open deck decks. The special design of the closed rib shape allows the slab ribs of the steel slab to be completely covered by concrete, just like the steel bars in the fired slab, so that the respective characteristics of steel and concrete can be maximized, and it is successfully applied to buildings with reinforced reinforcement. In the bearing plate system, it has excellent fire resistance.