In recent years, the incidence of breast cancer has been increasing year by year, which is a serious threat to women’s health and life safety and has become a veritable red-faced killer. Nowadays, the incidence rate of breast cancer in developed countries in Europe and America is as high as 108 cases/100,000, showing a trend of gradual increase, but the mortality rate related to breast cancer has shown a decline. Oncologists have conducted an in-depth analysis and found that the main reason is that western women have been screened for breast cancer at an early stage through regular mammograms in the last three decades. Early screening by mammography has enabled many breast cancer patients to be detected in the early stages of cancer, which has greatly advanced the clinical diagnosis of breast cancer and bought precious time to save patients’ lives and achieve better treatment. Mammography is a low-dose mammography technique that can clearly show all layers of breast tissue and can detect breast hyperplasia, various benign and malignant swellings and structural disorders of breast tissue, which is the most effective and reliable way to detect and diagnose breast cancer at an early stage. Because traditional mammography machines use molybdenum targets to emit X-rays instead of the tungsten targets of ordinary X-ray machines, mammography is often referred to as mammography for short. Why does mammography have such an important clinical value in breast cancer prevention and treatment? First, mammography has a non-substitutional role in detecting microcalcifications in breast tissue. Early stage breast cancer is characterized by tiny calcified dots or calcified masses less than 1mm in diameter, especially non-invasive breast cancer such as ductal carcinoma in situ, whose only manifestation is tiny calcified dots, which cannot be detected by infrared mammography and non-mammography examinations used in general medical checkups, and are also difficult to be detected by breast ultrasonography and MRI. With a resolution of 50 umm or less, early cancers less than 1 mm in diameter can be detected, and even the smallest in situ cancers can be detected, enabling reliable early screening of breast cancer. Regular mammogram can detect breast cancer two years earlier than the most experienced doctor’s palpation, which can reduce the mortality rate of breast cancer by 20-40%. Second, mammography has unique significance for breast cancer screening. Excluding the difference in detection of lesions, magnetic resonance mammography has high sensitivity to invasive breast cancer, but due to the high cost of magnetic resonance examination, it is not feasible to promote breast cancer screening in China; breast ultrasound examination has good application to distinguish the cystic solidity of tumors, but due to the difference in detection direction each time, it is difficult to compare the results between different examinations, which limits its application in screening. However, due to the difference in detection direction each time, it is difficult to compare the results between different examinations, which limits its application in screening. However, due to the difference in detection direction between each examination, it is difficult to compare the results between different examinations, which limits the application of mammography in breast cancer screening. Third, the technical development of mammography has brought the clinical use of mammography imaging to a new height. The molybdenum-rhodium dual target adds a rhodium target with a higher energy spectrum to the traditional molybdenum target, making it more suitable for imaging the dense breast of Asian women and women of a lower age group. The fully digital mammography machine uses a flat panel detector to replace the dark box film sensing system, so that the X-ray information through the breast tissue is directly converted into digital electronic information recorded, through computer processing, displayed on the fluorescent screen, and can also be transmitted in the network or further analysis and processing, not only to improve the detection of early occult breast cancer, but also to make the X-ray imaging dose of each mammography examination The dose is no more than the sunlight radiation received in a day sitting at the beach, and the damage is very small. Because of these features, mammography is known as a powerful weapon to prevent and treat breast cancer and fight against the red-headed killer. We have reasons to believe that mammography will bring strong support and infinite care to the health of women.