Abstract: The Incidence rate for youngpatients (≤35 years)is graduallyincreased. It is widelybelieved that young patients have a worse prognosis than the older. The patients with the age of less than 35 account for 5%～13% of the cases diagnosed, whose main rask factors include a family history of breast cancer and more frequent BRCA1/2 mutations. The early diagnosis for the young breast-cancer population is difficult because of the pycnotic glandular organs. It is useful to improve early diagnosis rate and survivals by reviewing its prevalence, risk factor, clinical diagnosis, pathological and biological features and therapeutic regimen.