For the layout of the high-voltage wiring harness, the wiring harness should be protected as much as possible to minimize the relative movement between the wiring harness and the vehicle body. Due to the high strength of the high-voltage wire harness, different treatments are required according to the length of the wire harness. Generally, smooth and burr-free brackets, wire grooves, wire clips, cable ties, etc. are required to be fixed; when fixing with cable ties, the fixing method should be fully considered. In order to choose the appropriate cable ties for fixing, and avoid the risk of fixing failure. The distance between the wire harness fixing protection parts shall not be greater than 400mm. And the high-voltage wiring harness shall not interfere with the moving parts, and the distance between the two shall not be less than 50mm. The pure electric vehicle power battery is arranged in the lower bottom plate at the rear of the vehicle. The high-voltage wiring harness drawn from the front end of the battery passes under the vehicle bottom plate and is close to the ground. It is necessary to add bellows protection outside the cable to prevent the high-voltage wiring harness from being damaged during driving. Stones splashing on the road, etc. Due to space requirements, the wiring harness cannot be protected by corrugated pipes in some locations. Consider adding a plastic wire groove outside the high-voltage wiring harness to protect the wiring harness.