Electromagnetic energy not only creates enormous wealth for humanity, but also brings certain hazards, known as electromagnetic pollution. Studying electromagnetic pollution is an important branch of environmental protection. In the past, people referred to the interference received by radio communication devices as electromagnetic interference, indicating that the device is at risk of external interference invasion. In fact, it itself also causes harm to other external devices, becoming a source of interference. Therefore, it is necessary to simultaneously study the interference and interference of the device, and pay attention to the compatibility between the internal organization and devices of the device. With the development of science and technology, the increasingly widely used microelectronics technology and the gradual realization of electrification have formed a complex electromagnetic environment. Continuously researching and solving the problems of equipment and system relationships in electromagnetic environments has promoted the rapid development of electromagnetic compatibility technology. Compatibility measures: ① The use of a complete shielding body can prevent external radiation from entering the system and also prevent the interference energy of the system from radiating outward. The shielding body should maintain integrity, and essential doors, seams, ventilation holes, and cable holes must be properly handled. The shielding body should have reliable grounding Design a reasonable grounding system, with small signal, large signal, and interference generating circuits grounded separately as much as possible, and grounding resistance as small as possible Using appropriate filtering techniques, the passband of the filter is reasonably selected to minimize leakage losses as much as possible When using amplitude limiting technology, the amplitude limiting level should be higher than the working level and should be bidirectional. ⑤ Correctly select connecting cables and wiring methods, and replace long cables with optical cables if necessary. ⑥ Using techniques such as balanced differential circuit, shaping circuit, integral circuit, and gate circuit, ⑦ the system frequency allocation should be appropriate. When multiple main frequency signals are working in a system, try to avoid the frequency of each signal, or even avoid the resonance frequency of the other party. ⑧ When conditions permit, various equipment in shared corridors should maintain a large separation distance to reduce the impact on each other