The real vehicle test is generally carried out when the electric device C sample is in the OTS state of the whole vehicle. The real vehicle test takes into account both the wiring harness layout verification and the power distribution design verification, and can realize design verifications such as the rationality evaluation of the actual vehicle layout of the wiring harness system, the verification of the power distribution design, and the current distribution of the grounding point. However, the real vehicle test requires vehicle resources, and the investment is also the highest. In the real vehicle test, overloading or abuse of electrical functions will occur, which will also damage the vehicle. After the test, the vehicle will generally be scrapped, and the reuse rate of resources is not high.