In the overall environment of the vehicle, the working environment of the wiring harness can be said to be the worst, not only to work in corrosive liquid or gas, but also to be affected by high temperature and collision. Phenomena such as the environment, insulation wear or wire corrosion often occur and cause short circuits, and the wiring harness must be designed with corresponding protection to work properly. From a vehicle perspective, the wiring harness must be protected, kept away from heat sources, and its length and orientation must be controlled. Each section of the wiring harness must be secured to avoid interference between the wiring harness and surrounding components due to vehicle vibration. This negatively affects stability, especially as the harness passes through body holes and rubber plugs that protect the harness from cuts and water or dust leaks. The wiring harness should be designed with outsourcing, which can play the role of wear resistance, cutting resistance and corrosion resistance, and improve the reliability of the wiring harness. There are many types of packaging materials for wiring harnesses. In high temperature areas with harsh environments and many surrounding parts, corrugated tubes with higher heat resistance levels, such as engine wiring harnesses, should be selected for packaging. The wiring harness in the cockpit, if the environment is better, can be wrapped with PVC tape or flannel tape. This means that different packaging materials must be used to wrap and protect the wiring harness depending on the specific environment.