The advantages of breast ultrasound examination compared with other examination methods are as follows: 1) non-invasive, can be done at any time, no physical trauma; 2) no pain, basically no secondary pain to the patient; 3) no radiation, which is different from CT, MRI and mammogram, no radiation means it has no associated carcinogenicity; 4) more sensitive to the early hypoechoic lesions of the breast, which is not possible with other examinations; 5) currently can be used as an auxiliary measure for early diagnosis and localization of inaccessible breast nodules, as well as an indispensable auxiliary localization tool in minimally invasive breast rotation surgery.