Shelf in the logistics system plays a very important role, along with the increasing amount of logistics and warehouse automation increase in the number, the number of shelves more and more, and requires its versatility, can be automated and mechanized requirements. The role and function of the loan holder is as follows: (1) loan due to take full advantage of the space frame position, improve warehouse space utilization string, increasing the storage capacity of the warehouse. (2) cargo planes in mortgage loan grid for easy access, easy to measure, easy to inventory, you can do the FIFO principle. (3) loan deposited cargo bay, and do not squeeze, you can easily take dust, moisture and other measures to ensure the quality of the goods themselves, reduce the loss of goods, improving storage quality materials. (4) the goods stored in the loan holder to facilitate the implementation of mechanized operations. There are many ways shelf classification, commonly classified as follows: (1) the extent of the loan in accordance with universal shelf can be divided into: General and special mortgage loan holder rack. (2) according to the manufacturer shelf materials can be divided into: steel shelves, reinforced concrete frame and wooden shelves loan. (3) in accordance with the degree of closeness of the shelf can be divided into: open shelves, semi-closed and closed-end loan rack shelves. (4) according to the different structure of the shelf can be divided into: shelves, floor grids, cabinet racks, drawers rack, Ken boom, tripod and a gate-type racks. (5) In accordance with the loan holder mobility can be divided into: Fixed mortgage holder, mobile loan holder, rotary loan holder, the combination of shelves, adjustable shelves and mobile storage shelves. (6) In accordance with the height of the loan holder can be divided into: the lower shelf (height of 5m or less), middle shelf (height 5m.15m), senior loan holder (height above 15M) o (7) in accordance with the loan holder deadweight can be divided into: light shelves (each shelf load in 150L8 less), medium-sized loan holder (each shelf load in 150ke.500k8), heavy loan holder (each loan holder in another load above L8) .