With the development of China’s modernization construction and rapid scale expansion of industrial and mining enterprises, the application of trestles of steel structure becomes wider and wider, and it proportion in the trestle structure becomes wider and wider, too. Especially for the trestles with height > 15m~20m, due to their characteristics of low construction cost and fast construction speed, the structure types of trestles of steel structure become more and more and are gradually developing toward the direction of large, high and heavy structure. However, with the continuous increase of the span, height and weight of steel structure trestle, the installation becomes more and more difficult. The installation can be carried out smoothly only through careful design. Only in this way can the further optimization and continuous innovation of structure type of large-span steel structure trestle be promoted. 
The truss is the unchanged geometric body made of rod elements, which can be used as independent structure and can also be used as a unit of the structure system to play the load-bearing role. The scope of engineering to which the truss of broad sense corresponds is very wide, for example, simply supported or continuously supported vertical truss can be used for bridges and roof truss, horizontally placed truss can be used for the crane brake system in the industrial workshop, wall surface wind-resistant bearing and belt conveyor corridor, and transmission tower, microwave tower, latticed column, etc. adopt vertical cantilever truss.