In 1990, King found that 20-25% of breast cancer patients had at least one relative with breast cancer. Hereditary breast cancer accounts for 5-10% of the entire breast cancer population. Hereditary breast cancer is mainly associated with genetic genes BRCA1 and BRCA2, and other genes such as P53, PTEN and CDH1. In addition to genetic predisposition, the incidence of breast cancer in family members is also related to similar physical characteristics, diet, personality, work and rest, environment and other factors. For other family members who have relatives with breast cancer, it is recommended to develop individualized prevention, physical examination and intervention programs to minimize the adverse effects of breast cancer on individuals and families through a comprehensive three-tier breast cancer prevention system.