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The biggest difference between the PCB multilayer board and the single-panel and double-panel is that the internal power layer (maintaining the inner electrical layer) and the ground layer are added. The power and ground networks are mainly wired on the power layer. However, the multilayer board wiring is mainly based on the top and bottom layers, supplemented by the middle wiring layer. Therefore, the design method of the multi-layer board is basically the same as that of the double-sided board. The key lies in how to optimize the wiring of the inner electrical layer, so that the wiring of the circuit board is more reasonable and the electromagnetic compatibility is better.