Cochlear implantation is mainly suitable for cochlear deafness but not for postcochlear deafness. 1. Cochlear and auditory nerve factors From an imaging perspective, the relative contraindications to cochlear implant surgery should be the complete absence of the cochlea and severe narrowing of the internal auditory canal. The cochlear implant is generally contraindicated when the internal auditory canal is less than 2 mm in diameter because of the lack of auditory nerve and vestibular nerve in the internal auditory canal. 2. Middle ear infection In patients with purulent otitis media, the implantation of electrodes can bring the infection foci to the inner ear, which is very dangerous. In case of cochlear implantation, the otitis media lesion should be completely removed first. The onset of purulent otitis media is one of the contraindications to cochlear surgery. Cochlear fractures Cochlear fractures are likely to damage the vestibular cochlear nerve and make cochlear implantation ineffective. Therefore, a cochlear fracture resulting in damage to the auditory nerve is a contraindication to cochlear implantation. 4. Psychiatric disorders Electrical stimulation may stimulate the cerebral cortex, so psychiatric disorders are a contraindication to cochlear implant surgery. 5. Other contraindications to routine surgical procedures and cochlear implantation are not considered.