The cause of breast cancer is still not fully understood. Current research has found that the occurrence of breast cancer is closely related to living habits and dietary habits, and the following aspects can be considered for the prevention of breast cancer: 1. Establish a good lifestyle: adjust the rhythm of life and maintain a relaxed mood; 2. Adhere to physical exercise: actively participate in social activities, avoid and reduce mental and psychological tension factors; 3. Develop good dietary habits. During infancy, pay attention to balanced nutrition and promote breastfeeding; during childhood development, reduce the intake of excessive high-protein and low-fiber diet to avoid early menstruation; during adolescence, do not consume large amounts of fat and animal protein and strengthen physical exercise; during menopause, control the total calorie intake to avoid obesity. Develop the habit of not consuming meat, fried eggs, butter, cheese, sweets, etc. in excess; eat less pickled, smoked, fried and baked foods; regularly consume fresh vegetables, fruits, vitamins, carotenoids, fish and legumes; 4. Actively treat breast diseases; 5. Do not use exogenous estrogens indiscriminately; 6. Do not drink alcohol in excess for a long time; 7. Avoid unnecessary chest x-ray exposure; Countries with a high incidence of breast cancer in the high-risk breast cancer The fact will tell us that breast cancer is a serious problem. The facts will eventually tell people that breast cancer is not only treatable but also preventable.