The value of mammography is as follows: First, it can be used as a relatively non-invasive examination method that can reflect the general anatomical structure of the entire breast in a more comprehensive and correct manner. Secondly, with the use of X-ray examination, the influence of various physiological factors on the breast structure can be observed, and dynamic observation can be made. Thirdly, benign lesions and malignant tumors of the breast can be identified more reliably. Fourthly, according to X-ray examination, certain pre-cancerous lesions can be detected and can be observed by follow-up radiographs. Fifthly, follow-up examinations can be conducted for breast cancer patients after radiotherapy and chemotherapy to observe the efficacy of treatment and to monitor the healthy side of the breast regularly. Mammography is comprehensive, intuitive, simple, safe and relatively inexpensive, and has become one of the best methods for routine clinical examination and preventive screening of breast cancer. It has contributed to the detection of early cancer and improved the diagnostic compliance rate of breast lesions and the survival rate of patients.