The multi-tier rack takes medium-duty or heavy–duty rack as the main part. Generally, the cold-rolled steel floor slab, checkered iron floor slab or steel grating floor slab is used. The single-tier or multi-tier rack can be designed according to the actual site and specific requirements, 2-3 tiers generally. The stairs, lift platform, hoist, conveyer belt and forklift are used for storage of the goods upstairs. Generally, the load capacity of multi-tier rack is 300kg-1,000kg/squ.m. It is widely applied to tall warehouses of small goods by manual storage in large quantities, and can make best use of space and save warehouse space. It is widely applied to auto parts, 4S store, light industry and electronics industry.