Although China had achievements in iron structures in the early stages, due to the constraints of over 2000 years of feudal system and underdeveloped science, it remained at the level of iron buildings for a long time. It was not until the late 19th century that China began to adopt modern steel structures. Later, the application of steel structures underwent significant development, far surpassing the past in terms of quantity and quality. It has reached a high level in design, manufacturing and installation, mastered the design and construction of complex buildings, and has built many steel structure plants with complex structures, long-span steel structure civil buildings and railway bridges in various places, the steel grid of sports halls in Beijing and Shanghai, the three hinged steel arch of the Qin Shi Huang Soldiers, Horses and Maids Exhibition Hall in Shaanxi, and the Bird's Nest in Beijing. The floor of light steel structure consists of cold-formed thin-walled steel frames or composite beams, floor OSB structural plates, supports, connectors, etc. The materials used are oriented particle board, cement fiber board, and plywood. These lightweight floors can withstand a load of 316-365 kilograms per square meter.