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In order to eliminate the incompleteness of signals in high-speed PCB technology, there are some key issues should be solved, including timing, noise, electromagnetic and so on, in the design process of the high-speed PCB technology. In the process of high-speed PCB of embedded RTU, this paper studies the problems like crosstalk, electromagnetic interference, ringing effect and power integrity and so on, and proposes the ways to weaken or eliminate those noises. Circuit schematics and PCB are drawn by using Altium Designer, PADS software and the reliability of the front and rear parts is verified by means of Hyper Lynx and ADS simulation software. At the same time, the layout of components and connectors and wiring rules are determined based on the simulation results. Finally, this paper verifies the completeness of signal through the wiring of the PCB. The electromagnetic compatibility test shows that this method can suppress noise effectively, enhance the reliability of high-speed digital circuit design, and increase the success rate of product design, having a great reference value for the personnel engaged in related work. And there are important references in the replacement and upgrade of smart devices and promotion of networking building. 