After the occurrence of facial palsy in children, when further results cannot be achieved through active specialist medication, physical therapy and rehabilitation training, functional reconstructive surgery can be considered as an option to further improve facial function. Functional reconstruction surgery for facial palsy has two purposes: first, to correct the physical dysfunction of the face; second, to correct the unhealthy psychological state by improving the appearance. The following is a sex-specific analysis. I. Facial physiological dysfunction that must be corrected by reconstructive surgery 1. Eye dysfunction: After facial palsy occurs, the patient cannot close the eyes and the cornea is easily damaged by long-term exposure, such as tear overflow with lower lid ectropion, which will also aggravate corneal dryness. Therefore, if the eye loses protection, 61% of the patients will have corneal ulcers and vision loss within one year, and blindness will occur seriously. 2. Mouth dysfunction: Small infants with bilateral facial palsy cannot be fed and must be gastrostomized, otherwise they are prone to die prematurely. For children in the speech learning stage, slurred speech after facial palsy affects speech development. Due to the incomplete closure of the lower lip, the food is easy to remain and lead to tooth decay. 3, nasal dysfunction: children have narrow nostrils, and the nostrils on the side of facial palsy will collapse. If both sides of facial palsy are paralyzed, the nasal ventilation of the lighter side will be severely reduced, affecting nighttime sleep breathing, and in serious cases, it will lead to airway obstruction. Improve the appearance and correct the unhealthy psychological state 1. Reduce or eliminate the social barriers caused by facial palsy, such as drooling, sad face, staring face, etc. 2.Restore the static symmetrical face. 3.Recreate dynamic symmetrical facial features. 4.Restore autonomous, dynamically symmetrical facial features.