A wire harness is a component that forms a connecting circuit after crimping the contact terminals (connectors) made of copper and wires and cables with plasticized pressed insulators or metal shells outside. Harness is composed of all kinds of wires, cables according to different loop number, hole number, position number and electrical principle requirements, through different types, performance of terminals, plug pieces, external protection and nearby system connection assembly of the harness. The cable harness has different functions in different parts of the device. Cables with different functions are selected according to application scenarios. Wire harness is the basic equipment for all kinds of equipment, instruments and instruments to realize the transmission of signals and electric energy. It is a necessary basic product in the future electrification and information society.