The principle of infrared thermal imaging is not mysterious. From the analysis of physical principles, the human body is a natural biological infrared radiation source, which can continuously emit and absorb infrared radiation to the surrounding. The temperature distribution of the normal human body has certain stability and characteristics, and the temperature of each part of the body is different, forming different thermal fields. When a disease or functional change occurs somewhere in the human body, the blood flow in that place will change accordingly, resulting in a change in the local temperature of the human body, which is manifested as high or low temperature. According to this principle, the infrared radiation of the human body is collected by a thermal imaging system and converted into digital signals to form a pseudo-color heat map. Using special analysis software, professional doctors analyze the heat map to determine the location of human lesions, the nature of the disease and The extent of the lesions provides a reliable basis for clinical diagnosis.