The upstream of the construction machinery industry mainly provides raw materials for the manufacture of construction machinery products, the steel industry, the coating industry and the parts manufacturing industry, such as steel for construction machinery, internal combustion engines, hydraulic systems, bearings, tires, etc. The midstream includes excavators, cranes, road rollers, bulldozers and other different types of construction machinery manufacturing enterprises; The downstream is mainly industries with demand for wires and cables, such as infrastructure construction, real estate, mine excavation, cement and rural construction.