The development of breast cancer is caused by multiple factors including genetics, genetic mutations, drugs, environment, diet, etc. There is no exact and effective way to prevent breast cancer. The following aspects can help to reduce the risk 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 stress factors, and maintain a peaceful state of mind. (3) Develop good eating habits. Control the total calorie intake to avoid obesity. Do not consume meat, fried eggs, butter, cheese and sweets in excess, eat less pickled, smoked, fried and baked foods, and increase the consumption of fresh vegetables, fruits, vitamins, olive oil, fish and bean products. (4) Actively treat breast diseases. (5) Do not use exogenous estrogens indiscriminately. (6) Do not drink alcohol in excess for a long time. (7) Learn more about the science of 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 problems before they occur.