Although China has the early iron structure remarkable achievement, but because of the 2,000 years of feudal shackles, science developed, therefore, long-term stay in the horizontal iron buildings. Until the 19th century, China began using modern steel structure. After the founding of new China, the application of steel structure has been greatly developed, both in quantity and quality, or far more than in the past. For example, Shanghai Steel Works Ltd. Jun is the structural system is mainly composed of steel, hot-rolled steel or cold-formed thin-walled steel by connecting manufacturing, assembled in the technical aspects, such as design, manufacture and installation have reached a high level, mastered the complex technical design and construction of buildings throughout the country has built a number of huge and complex structure of the steel plant, large-span steel bridges and other civil and railway, China's Great Hall of the steel and other roof trusses, Beijing and Shanghai stadium steel grid, Shaanxi Museum of Qin Shi Huang horses commission of three hinged steel arch Beijing Bird's nest and the like. High strength, light weight, homogeneous material, good ductility, toughness, superior seismic performance, simple to manufacture, high degree of industrialization, short construction period and so on. Light steel floor by a cold-formed steel or composite beam, floor OSB structural panels, supports, connectors and other components. The materials used are OSB, cement fiberboard, and plywood. In these lightweight floor surface can withstand the load of 316 to 365 kilograms per square meter.