Library shelves can be divided into metal bookshelves and wood bookcase in accordance with the material. The metal shelves which can be subdivided into a single column type, complex columnar, laminated shelves, sliding shelves dense stacks as well as so-called single cylindrical single cylindrical bookshelf refers to a single column on both sides of the metal tolerance level to each of Guanxi Books on the segment separator weight, length of each block shelves 90cm, also can be used alone continued access arrangement. Generally their bookshelf more than 200cm in height, the top spot will Tied coherent, to ensure safety. It refers to a complex cylindrical side shelves, each with two or more pillars to withstand horizontal partition load transfer books. However, in order to promote the beauty, and the top spot on both sides of the metal complex columnar shelves, additional wooden board. Laminated bookshelf: In order to fully utilize the limited space library collection a lot of books, rugged durability features of the application of laminated steel materials offer display shelves for books, is a good approach. However, each country has its own specifications for the bookshelf provisions, such as the United States is taken each laminate bookshelf clear height 2280mm, each divided into 5-7 segments; the United Kingdom and other European countries, each clear height of the mining 2250mm, clapboard-sided width of 200mm, width of 50mm sliding pillar bookshelf intensive intensive use of rail sliding shelves can be divided into two kinds of manual and electric form. Two specialized fixed shelves by the middle of the base of the rail, the guide slide, is one of the effective use of the limited space of a large number of books collection methods. Wooden bookshelf materials, including processed by a combination of forming solid wood, plywood, wood core board, particle board, etc., to paint coating or surface decoration materials patch, rich and soft texture. Libraries commonly in the form of an upright, tilt base L-type shelves, is to allow readers to take reading books, with different types of specifications. Stacks intensive intensive bookshelf (Compact Shelving) is in the early twentieth century by the Swiss Hans Ingold designed. Through the development and evolution of nearly a century, more and more widespread use of intensive bookshelf, now there are two different forms. Activity one is made of metal shelves, characterized in that the shelves of the axial direction (longitudinal direction) and perpendicular to the track direction. Another is made from wood, axial and orbital direction shelves are parallel, many domestic library auditorium are using it to store audio-visual materials. Intensive bookshelf main and obvious feature is a collection of space-saving. It will be placed around the bookshelf closely together, and then take the track to move the bookcase, bookshelf space saving front walkway, so in the limited space can be placed more information books. Since the bookshelf between