External auditory canal atresia or stenosis is complete atresia, often accompanied by middle ear hypoplasia. Hearing impairment is seen in congenital microtia. Acquired patients are mostly caused by scar contracture after burn, infection or trauma (including surgery), which may affect hearing slightly, and cholesteatoma of external auditory canal may occur in severe cases, even involving tympanic membrane, middle ear and mastoid sinus. X-ray examination can understand the middle ear and mastoid process. Surgical excision of scar release contracture can restore the shape, diameter and conduction function of external auditory canal. Wrap a rubber or plastic tube with a flap of medium thickness so that the meat faces outwards for implantation. After the skin graft survived, it was supported for 6 months to prevent retraction. Membrane scar or reticular scar at the mouth of external auditory canal can be repaired by local staggered flap or "Z" plasty.