Mammography, also known as mammoplasty, is currently the first choice and the easiest and most reliable non-invasive test for diagnosing breast disease, with relatively little pain, simplicity, and high resolution, good repeatability, and images that can be retained for before and after comparison, regardless of age and body shape, and is now used as a routine test. The significance is as follows: 1. It can be used as a relatively non-invasive examination method, which can reflect the general anatomy of the whole breast in a more comprehensive and correct way. 2, using X-ray examination can observe the influence of various physiological factors (such as menstrual cycle, pregnancy, lactation, menstruation and endocrine changes) on the structure of the breast, and can make dynamic observation. 3.The benign lesions and malignant tumors of the breast can be identified more reliably. 4.According to X-ray examination, some pre-cancerous lesions can be detected and can be observed by follow-up radiographs. 5.For breast cancer patients after radiotherapy or chemotherapy, follow-up examinations can be conducted to observe the therapeutic effect and regular monitoring of the healthy side of the breast. 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, contributing to the detection of early cancer and improving the diagnosis rate and survival rate of patients.