Primary nipple inversion is a common developmental abnormality of female breast, due to the concavity of the ectoderm at the beginning of the original breast buds to form the breast fossa at the late stage of nipple development, and later the proliferation of mesenchyme underneath it to raise outward to form the nipple, and if this process is stagnant, then it will form the nipple inversion, and about 1/4 of the patients are bilaterally. Secondary nipple inversion is formed when the nipple cannot protrude due to the pulling of pathological tissues in the breast, which is often a typical feature of breast inflammation or even breast cancer. According to the degree of inversion, it is divided into 3 types: Type I: nipple is partially inverted, nipple neck exists, and the inverted nipple can be easily extruded by hand, and the size of nipple is similar to that of mortals after extrusion; Type II: nipple is fully inverted in the areola but the nipple can be extruded by hand and the nipple is smaller than normal, and there is no nipple neck in most of the cases; Type III: the nipple is completely buried underneath the areola, and it is not possible to make the inverted nipple to be extruded. Nipple inversion not only affects the beauty of breast and breastfeeding function, but also is difficult to be cleaned locally, and the sunken part is easy to hide dirt, which often causes local infections, and the mammary ducts are connected to the sunken part, so the inflammation can spread to the mammary glands and cause mastitis, I suggest that the corrective surgery of primary nipple inversion should be completed before marriage, and the I-degree inversion can be treated by manipulation or negative-pressure suction, and for the II-degree and III-degree inversion, surgical treatment is needed. For degree II and degree III nipple inversion, surgical treatment is needed. 1, manipulation and traction: make nipple stretching exercise, put two thumbs parallel to both sides of the nipple, slowly open the nipple to the outside of both sides, pulling the areola skin and subcutaneous tissues, and repeat for many times, and then put two thumbs on the upper and lower sides of the nipple, and pull the nipple upward and downward in a longitudinal manner, 2 times/d, each time for 5min, only effective for I degree. 2.Negative pressure suction: use breast pump to perform negative pressure suction on the nipple, or buckle an empty cylinder of 5~10ml empty syringe on the areola, the nipple of the syringe connects a rubber tube with another syringe, and the latter’s piston creates a negative pressure, which can help the nipple suctioned out, which is only effective for the I degree. 3.Surgical treatment: if breast development is complete and nipple inversion is not effective after repeated pulling or negative pressure suction treatment, nipple inversion revision surgery can be carried out. At present, continuous external nipple traction surgery is less traumatizing and breastfeeding function is completely preserved.