Infrared mammary glands diagnosis instrument is a large-scaled mammary glands medical imaging work station that can represent the intranational advanced level at present. According to the theory of different degrees of different organs absorbing the infrared light, it adopts transilluminating mammary glands by infrared light, through the computers processing,different organs changes appear in different images. Then according to different grey degrees of the images and the relationship between the blood vessels change and the grey degree, categorized mammary glands diseases can be diagnosed.