The BI-RADS classification of the breast is divided into 7 categories: reaching category 3 or above presents some possibility of malignancy. Category 1.0 is undetermined and requires further evaluation with imaging. Class 2.1 is negative, with no positive clinical signs and no abnormal signs on breast ultrasound imaging or mammogram. Class 3.2 is definite benign breast calcifications and benign masses that essentially rule out malignancy. Class 4.3 is almost benign lesions, the possibility of malignant rate is very small, the general recommendation is to review in 3 to 6 months. 5.4 category is suspected malignant lesions, four categories are subdivided into 4A, 4B, 4C; 4A is more inclined to benign possibilities, such as fibroadenomas with clear borders, complex cysts, intraductal lesions with nipple fluid or blood overflow, the malignant rate is in the range of 2% to 10%; 4B is inclined to malignant, such as some of the fibroadenomas with fuzzy borders, the malignant rate is in the range of 10% to 50%; 4C suggests a higher likelihood of malignant possibilities, most of them with unclear borders, irregular-type solid masses with a malignancy rate of more than 50%. Category 6.5 is highly suggestive of malignancy, with a malignancy rate of greater than 95%, and an irregular mass with burrs and associated polypoid calcifications. Category 7.6 is a malignant tumor that has been confirmed by pathology. These are the breast BI-RADS classification criteria, in the clinic can be based on the different types of disease progression, choose a reasonable treatment plan, the specific treatment can consult a professional physician’s opinion.