The cause of breast cancer is not fully understood, so there is no definite method to prevent breast cancer. From the analysis of epidemiological survey, the prevention of breast cancer can be considered in the following aspects: 1. Establish a good lifestyle, adjust the rhythm of life, and keep a relaxed mood. 2.Adhere to physical exercise, actively participate in social activities, avoid and reduce mental and psychological tension factors, and keep a calm mind. 3.Cultivate good eating habits. Pay attention to balanced nutrition during infancy, and advocate breastfeeding; reduce the intake of excessive high protein and low fiber diet during childhood development; do not consume large amounts of fat and animal protein during adolescence; control the total calorie intake after menopause to avoid obesity. 4.Actively treat benign breast diseases (intraductal papilloma, ductal dilatation, cystic hyperplasia of the breast, etc.). 5.Do not use exogenous estrogen indiscriminately. 6. Avoid long-term excessive alcohol consumption and smoking. 7.Carry out strict follow-up system in the high-risk group of breast cancer. 8. It is recommended that women should know some scientific knowledge about breast diseases, master the methods of breast self-examination, develop the habit of regular breast self-examination, and actively participate in breast cancer screening to prevent the disease before it happens.