Space is more effectively used because the working passage for the struck and the storage space are combined together , but only one kind goods is stored along one working passage or the goods along one passage has to be done at one time, this type of racking is widely used in th industries of icehouse storege ,food adn tabacco. Warehouse occupied as soon as possible. First in and first out, or first in and last out can be true. Suitable to store a large quantity of goods but few kinds.。