Many people have asked whether a cochlear implant in patients with severe sensorineural deafness on one side and severe sensorineural deafness on the other side can provide better hearing in both ears due to the difference in signals between the two ears. A large number of clinical studies in China and abroad have shown that these patients with unilateral profound sensorineural deafness are able to integrate the acoustic and electrical signals from both ears after cochlear implantation, thus achieving binaural hearing. This is also due to technologies such as fine structure coding (FSP) technology of modern multichannel cochlear implants and more complete audio (the latest cochlear implants receive sound in a frequency range expanded to 70~10000Hz), which makes the auditory sound of the cochlear implant closer to natural and realistic, so there is no clear difference between the normal ear and the implanted ear after auditory integration, and the implantee feels like responding to the implanted ear hearing with the normal side There is no clear difference between the implant and the normal side! In addition, patients with unilateral severe deafness can have more outstanding performance in the following aspects after cochlear implantation: 1. the integrated hearing of both ears is higher than unilateral; 2. the speech recognition rate in noisy environment is significantly improved; 3. the orientation and localization ability of sound source is significantly improved; 4. the disturbance of tinnitus in the affected ear before surgery is significantly reduced, which can reduce the disturbance of tinnitus with an efficiency of >95%; 5. the implant side does not affect the speech hearing ability of the contralateral normal ear. speech listening ability of the opposite side. Therefore, the cochlear implant can be implanted on the deaf side of a person who has good hearing in one ear and severe sensorineural deafness in the other ear, and it is clinically recommended to implant the cochlear implant on the deaf side as early as possible, which is related to the hearing deprivation and neurological degeneration on the deaf side.