Polymer plastic steel bridge is mainly divided into two types: composite plastic steel bridge and steel lined plastic steel bridge. It is a kind of bridge products of new materials. The products have been widely used in chemical, petroleum, electric power, medicine, construction and other industries and coastal areas. It can replace the traditional cable tray, has been widely used in developed countries in Europe and America, is the preferred cable tray for future engineering applications, in line with the national policy of "replacing steel with plastic", and has the characteristics of flame retardant, corrosion resistance, excellent mechanical strength, good insulation performance, reasonable structure, beautiful appearance and long service life. It integrates the use of steel bridge, glass steel bridge and aluminum alloy bridge in different working conditions and climate conditions after research and development.