Ear canal obstruction is a common manifestation of congenital microtia. Patients have no external auditory canal, but most of them do not involve the inner ear, which has a certain impact on hearing. At this time, external auditory canal reconstruction surgery is needed. Reconstruction of external auditory canal is to rebuild the external auditory canal and restore its sound transmission function to the middle ear, thus improving the hearing of patients. External auditory canal plastic surgery can be performed simultaneously with primary auricle plastic surgery, or separately or together with secondary auricle plastic surgery. The operation is simple and narrow. It is feasible to make an incision in the ear, separate the flap, remove the scar, cut off part of the bone wall of the external auditory canal, enlarge the external auditory canal and plant split skin graft on the wound. Can patients with microtia pass through the ear canal? What effect will impassability have on ears? Because ear reconstruction surgery is generally performed after the child is 7 years old and the ear growth and development are basically mature. Some parents will have questions: Will atresia of external auditory canal affect hearing? What effect will it have on children's growth and development? Dr. Yu Wenlin, dean of Shang Gao Medical Beauty Center and executive director of the Technical Committee of China Plastic Surgery Association, said that the external auditory canal can hear sounds, but the hearing loss is different. Generally speaking, it is the part that affects auditory conduction, resulting in partial hearing loss. But you can also rely on bone conduction to help listening. However, congenital atresia is often accompanied by other congenital external-middle ear developmental malformations, even the developmental malformations of the inner ear and auditory nervous system. In this case, the impact on hearing may be very serious, and even severe deafness or total deafness may occur. Another condition is cicatricial ear canal obstruction, which is usually caused by burns or other trauma. Acquired external auditory canal closure principle, through surgical resection of scar release contracture, restore the shape and size of external auditory canal and its conduction. External ear reconstruction surgery can also be performed to restore the external ear to its normal shape.