The common abnormalities of breast development are parametriosis (polymastia), asymmetric breast deformity, Poland syndrome, gynecomastia, and gynecomastia. 1, parametrium Parametrium is congenital polymastia, the patient is mostly female, most of the lesions are bilateral, above or below the normal breast can be one or more baby breasts appear; or only a little skin pigmentation, that is, the original parametrium areola; or only a local skin thickening, that is, the nipple of the parametrium; may also have both nipple and areola. Sometimes the parametrium can develop to a full extent into adulthood, with significant enlargement before menstruation and even milk production during lactation. The treatment of parametrial breast can be done by removing the nipple and breast tissue according to the specific situation, or by using a combination of fat aspiration or fat aspiration and excision. 2, breast asymmetry The cause of breast asymmetry is still unclear, manifesting as uneven breast development on both sides, one large and one small, or in severe cases, only one breast or a side with a hidden breast tissue. Common types of breast asymmetry and treatment principles are as follows: (1) bilateral breast dysplasia and asymmetry: bilateral unequal breast enlargement is required; (2) unilateral breast dysplasia: unilateral breast enlargement is required; (3) hypertrophy of one breast and dysplasia of the other side: reduction of the hypertrophic side and enlargement of the small breast side is required; (4) unilateral breast hypertrophy: unilateral breast reduction is required; (5) (6) Breast asymmetry due to trunk deformity: such as chest wall or spinal protrusion deformity distorts the structure of the thorax, resulting in breast asymmetry, when only the lower breast needs to be raised to the level of the higher breast. 3.Poland’s syndrome Poland’s syndrome refers to congenital unilateral pectoralis major, pectoralis minor, breast, nipple, areola, hypoplasia or lack of development, often combined with hand and arm deformities, especially often combined with short fingers and parallel fingers deformity of the hand. Except for the hand deformity, the syndrome has little functional impact on daily life, so the treatment is mainly to adjust the shape of the anterior part of the chest, including the breast. In the absence of the pectoralis major muscle, the thick anterior axillary margin disappears and the anterior chest wall is flattened compared to the opposite side, which is an orthopedic problem even in men, but even more so in women due to hypoplasia or absence of the affected breast. In female patients with breast agenesis, the nipple-areola position is usually higher than the healthy side, and it is necessary to obtain correction of this position anomaly along with breast reconstruction. In Poland’s syndrome, the breast reconstruction procedure is chosen according to the degree of absence of the pectoralis major and minor muscles, and sometimes breast augmentation can be performed by filling the affected side with appropriate silicone gel implants of different sizes to make both sides of the breast symmetrical, harmonious and balanced. If the absence of pectoralis major and minor muscles is serious, it is difficult to recreate a satisfactory chest wall and breast, commonly used to increase the breast by transferring the latissimus dorsi muscle and reconstructing the latissimus dorsi muscle to treat, will obtain satisfactory results, female patients can wear swimsuits and participate in social activities with confidence as normal people after surgery.