1. remove diseased tissue to prevent intracranial and extracranial complications; 2. improve hearing; 3. address ear drainage; 4. repair the eardrum to facilitate activities such as swimming. The protective role of the middle ear is compromised. The tympanic membrane is the gateway to one side of the middle ear, by which the outer ear is separated from the middle ear and protects the middle ear cavity. After the perforation outside bacteria, sewage and foreign bodies can carry the middle ear through the perforation causing infection and pus flow. Hearing loss due to perforation: Sound first vibrates the eardrum and then travels to the cochlea via the middle ear auditory chain, which in turn causes a nerve reflex to form hearing. After perforation of the eardrum, the effective vibrating area of the eardrum is reduced, and the energy of external sound waves transmitted to the inner ear is weakened, resulting in hearing loss. After tympanoplasty, it possesses a protective effect on the middle ear, which can reduce the chance of recurrence and improve hearing at the same time. Note: Middle ear surgery generally does not resolve neurological tinnitus!!!