Structural feature: Regarding the gravity pallet racking, by using roller rail system or pallet with roller and under the influence of gravity, "first in and first out” of goods is achieved. It is suitable for storing large quantity of goods with the same kind, taking full advantage of storage space. It is especially suit for the goods which short quality guarantee period and can’t be pressed for long time. In order to get the goods move freely, the racking should be equipped with brake if the slope is long; in order not to make the goods turn over when reaching to the bottom under great dash, the lower end of the slope should be equipped with separators and buffer. The loading capacity is less than 1000kg per pallet.