The nostril is made up of fibrous links between the nasal soft tissue, the inferior lateral cartilage, the membranous nasal septum and the anterior maxilla. The medial, middle and lateral pedicles of the inferior lateral cartilage play a role in supporting the nostril shape. Oversized nostrils are divided into mild, moderate and severe, which can be corrected by nostril reduction surgery, and the procedure includes the following: 1. Nasal groove incision method: This method is simple and easy to operate, but it is only applicable to those with overly wide nostrils. For those who simply have too much and wide nasal base tissue or those who have wide nasal wing and nasal base tissue at the same time, the postoperative effect is poor because the nasal base cannot be effectively trimmed; 2. medial nasal wedge tissue block excision method; 3. nasal base pike tissue block excision method: this method is only applicable to those who simply have wide nasal base resulting in oversized nostrils; 4. nasal vestibule diamond-shaped tissue block excision method; 5. nasal base tissue buried guide suture method; 6. nasal wing base excision Surgery: the purpose is to narrow the base of the nostril that is too wide and the nostril that is too large; 7. nasal base excision: for those with enlarged nasal wings, part of the lateral foot of the nasal wing can be removed; for those with wide nasal base, part of the nasal threshold can be removed to narrow the base of the nostril; 8. yellow nasal cartilage support is weak, it can also be strengthened by implanting artificial materials or own cartilage, or adjusted together with nasal tip surgery.