After breast cancer surgery, especially for patients who have axillary lymph node dissection, long-term postoperative subcutaneous fluid accumulation is more common, some are related to postoperative lymphatic leakage, and some are related to improper postoperative axillary pressure bandaging, and the current conventional treatment is to aspirate with a needle every few days and then pressure bandage, which is very painful for patients! This problem should be solved, first of all, from the surgical strategy, at present, the sentinel lymph node biopsy has become the international conventional treatment, but not many hospitals in China carry out, mainly related to the false negative of the sentinel lymph node, if the level of training can be, the axillary physical examination including ultrasound examination, if no obvious lymph node enlargement is found, it is recommended to perform the sentinel lymph node biopsy, if there is no cancer cells, the axilla does not need to be cleared, so that from enabling 70% of patients to avoid excessive axillary lymph node dissection and avoid possible subcutaneous effusion.