The process of wire harness includes many links such as off-line, down-tube, crimping, pre-assembly, hanging plate and inspection. Generally, the narrower downline mainly refers to cutting and stripping the coiled wire. In a broad sense, downline includes splicing, crimping, punching, heat shrinking, etc. The offline process mentioned in this article mainly refers to the generalized offline process. Among them, after the sealing plugs are inserted into the appropriate positions at both ends of the wire, the crimping terminal refers to crimping the terminals on both ends of the wire, and the sealing plug, the wire and the terminal are firmly connected after crimping. Use stamping or ultrasonic welding to connect the wires in a loop. After punching, the exposed copper wire of the wire should be coated with heat shrink tubing with adhesive for heat shrink protection. The offline process performed by the process designer usually includes an offline table and a clock diagram. The off-line table mainly includes wire rod, wire diameter, wire color, wire number, wire diameter parameters, and the processing method of both ends of the wire (pressing terminals, wearing sealing plugs, etc.). The check-in diagram is a simple chart that guides the completion of the workshop. Check-in, including the check-in line number, the check-in order for each line, the check-in method, and other required pertinent information. At this stage, domestic automobile wiring harness manufacturers mainly use the traditional drawing processing method, that is, combine the wiring harness design drawings of the whole vehicle, plan the process through manual or process design system, and then transmit the process card to the production workshop. Manual methods are cumbersome, inefficient and prone to errors, and many manufacturers of automotive wiring harnesses are beginning to use computer-aided process planning (CAPP). When using this method for off-line process design, you can first convert the drawing into a chart that can be recognized by CAPP software, and then use the data stored in the CAPP background to match the off-line list and automatic punching process with the check-in drawing.