The multi-objective optimization design principle requires that the objectives of each component are optimal. If you can get this result, it is very ideal. However, in fact, solving the multi-objective optimization design problem is a more complex problem, especially when the optimization of each sub-objective is contradictory or even mutually opposed. In order to solve this problem, it is necessary to coordinate the sub-goals and make certain "concessions" between them, so as to obtain the optimal solution that is closer to the requirements of the sub-goals and is more reasonable.