Bailey bridge is standard bridge equipment, adopted extensively and the most popular in the world, possessing the features of simple structure, convenient transport, speedy erection and easy disassembling. While having the advantage of heavy loading capacity, great stability and long fatigue life being capable of an alternative span, loading capacity and mixture form to erect all kinds and usage of temporary bridges, emergency bridges and fixed bridges. The bridge has the advantages of few components, light weight and low cost.