Surgery for breast cancer with axillary preservation means that patients without axillary lymph node metastasis only have the lesion removed and do not require axillary lymph node dissection. For breast cancer patients, the status of the axillary lymph nodes needs to be evaluated by sentinel lymph node biopsy. If the test result is negative, it confirms that there is no lymph node metastasis, and the chance of subsequent lymph node metastasis is relatively small. The removal of the breast, or both the pectoralis major and pectoralis minor muscles, is usually performed at the time of surgery depending on the patient’s condition, and does not require axillary lymph node dissection. This type of surgery is commonly known as breast cancer axilla preservation. If the patient’s primary tumor is under 3-4cm in diameter, the ipsilateral axillary lymph nodes are not touched or touched without considering metastasis; the tumor is isolated and far away from the nipple and areola; and the ratio of the mass to the volume of the breast is better, it is recommended to improve the biopsy of the anterior sentinel lymph nodes to clarify whether axillary lymph node dissection is needed.