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 In the practical application of POE power supply system, there are many aps or aps and antennas of mobile base stations, which are often installed at high points of buildings. Therefore, these aps are also prone to lightning strikes. Therefore, for this kind of data network center, we should not only consider the construction of good direct lightning protection net and good grounding system, but also consider the lightning induction and lightning wave invasion protection. Inductive lightning is a lightning discharge between lightning clouds and when lightning clouds discharge to the ground, nearby outdoor power lines, transmission signal lines, and connecting lines between equipment generate electromagnetic induction and invade equipment, causing damage to connected lines or terminal equipment. Lightning wave invasion refers to the invasion of lightning wave along the transmission line by direct strike or electromagnetic induction and electrostatic induction