Breast cancer is the most common malignant tumor in women worldwide，and its incidence is increasing year by year in China.Traditional Chinese medicine is an important part of breast cancer prevention and control in China.More and more attention has been paid to how to use traditional Chinese medicine theory to prevent and cure breast cancer.In our clinical practice，we have used the “three discriminations” theory of combined syndrome differentiation，disease differentiation，and constitution differentiation to treat breast cancer，collecting information on diseases from multiple directions，and comprehensively judging the occurrence，development and prognosis of diseases.The effect is now summarized to the readers.