Abstract: It's shown by theoretical studies and practices that reasonable PCB design is one of the key techniques for solving the EMC(electro-magnetic compatibility) problems of high-speed electronic systems.High-speed PCB designers are facing challenges while designing electronic systems to meet the international EMC regulatory requirements.In order to improve high-speed PCB design,the designers should correct or abandon some conventional PCB design ideas and practice.From the point of practical use,several misunder...