In the steel structure construction engineering, many factory buildings are designed with light steel structure.In light steel structure engineering, in the design stage, we should think about the smooth elements in the processing, manufacturing, installation and construction stage, as well as various design assumptions in the design stage, and strictly examine and approve each link.This requires proper and loose design and installation disclosure to prevent quality incidents. 

The tensile and compressive strength of the steel structure is absolutely high, the section of the component is small, the self weight is light, the structure function is good, the establishment progress is fast, the environment purification is small, because the steel structure engineering is practical in many kinds of structural ways and places, such as: column, beam, truss, rigid frame, arch, grid frame, suspension cable, etc.Practical places such as: steel structure industrial workshop, high-rise buildings, sports venues, steel structure residential buildings, bridges and various public buildings.In particular, with the establishment of Beijing Olympic Stadium and Shanghai World Expo venue, a large number of steel structures have been widely used, which fully demonstrates the characteristics and advantages of steel structures.Although a large number of steel structure engineering is widely used, many simple achievements and technical problems in the design, processing and construction of steel structure engineering have not been fully understood.Steel structure engineering, especially steel structure construction engineering, is a high-risk industry. Therefore, light steel structure requires high quality of designers, processors and constructors.A little carelessness, thoughtlessness and experience will lead to the emergence of quality insurance incidents, and even the fall of the whole, forming a major obligation incident.The quality accidents of steel structure engineering can be divided into design reason accidents, processing reason accidents, installation reason accidents and application reason accidents.According to the elements of the incident, it can be divided into many elements, many elements and simple elements