The temperature of all parts of normal human body is normal, and the image displayed on the computer screen is yellow-green. If it is high, it will turn red; if it is low, it will turn dark green. In the process of changing from normal to abnormal, different cells in the human body release different amounts of heat, that is, infrared rays with different wavelengths and amplitudes are released, and the thermal radiation of normal cells and abnormal cells is also different. By comparing the thermal radiation images produced by normal metabolism of healthy cells with those produced by abnormal structures, we can judge the degree of human body, so as to find the lesions earlier and prevent them.