There are three key elements to consider when analyzing and solving electromagnetic compatibility problems: interference sources, coupling pathways, and sensitive equipment. The source of interference refers to the equipment, system or signal source that generates electromagnetic interference, which can be radio transmitters, power equipment, electronic equipment and so on. The coupling pathway refers to how the interference signal is transmitted to the sensitive equipment through electromagnetic fields, wires, power lines, ground lines, etc. Sensitive equipment is equipment or systems that are susceptible to interference, such as wireless communication equipment, sensors, computers, etc. These three elements are interrelated, and the absence of any one of them can lead to the non-existence of EMC problems. Electromagnetic signals generated by interference sources are transmitted into sensitive equipment through coupling pathways, thus causing interference. Understanding the characteristics of the interference source, the frequency, amplitude and waveform of the interference signal, and the transmission characteristics of the coupling pathway can help us to identify and understand the root cause of electromagnetic compatibility problems. Understanding the anti-interference capability of sensitive equipment and work requirements, you can take appropriate measures to reduce or eliminate the impact of interference on sensitive equipment.