The incidence of breast cancer is closely related to unhealthy lifestyle overweight abnormal metabolism and high estrogen level. In recent years the value of exercise in the prevention and treatment of breast cancer has become increasingly prominent. The clinical research results show that exercise plays an important role in the prevention and treatment of breast cancer. In terms of prevention exercise can effectively reduce the risk of breast cancer by reducing the volume of estrogen sensitive breast the level of estrogen in the body and the rate of body fat. For early patients receiving adjuvant chemotherapy neoadjuvant chemotherapy local radiotherapy or endocrine therapy exercise can not only improve cardiopulmonary function and enhance physical fitness but also regulate emotions and sleep reduce fatigue alleviate chemotherapy adverse reactions relieve joint pain maintain muscle and bone density improve quality of life and improve prognosis. For surgical patients exercise can help prevent or alleviate lymphedema improve upper limb function and enhance quality of life. For survivors of breast cancer exercise can enhance muscle strength and cardiopulmonary function regulate metabolic syndrome and reduce long - term recurrence rate. For patients with advanced breast cancer exercise can reduce fatigue and improve the quality of life. In conclusion this article summarizes and reviews a series of studies on exercise and breast cancer pointing out that patients may benefit from various types of aerobic or resistance exercise whether alone or in combination. Women should choose appropriate exercise methods and intensities based on their own situation. Further research is needed in the future to develop more accurate and personalized exercise programs to help prevent and treat breast cancer.