Cochlear implants, also known as electronic cochlear implants, are currently an effective hearing and speech rehabilitation method for severe and profound sensorineural deafness. Cochlear implants have enabled the majority of deaf patients to recover their hearing and speech and return to the audible world, but there are a small number of patients who do not do well after cochlear implantation, which means there are individual differences in cochlear implants. (3) the degree of deafness: whether there is an auditory response; (4) the number of residual auditory nerves: there must be a certain number to ensure that the cochlear implant works; (5) whether the cochlea is malformed: patients with severe cochlear malformation generally have poorer results; (6) the level of education, intelligence, age at implantation, preoperative language ability and listening experience, and the patient’s desire and expectation to regain hearing services. Children and adults with prelingual deafness often have poorer results than postlingual deafness, and prelingual deafness is better with implantation before age 7 as opposed to implantation after age 7. 2. Surgical factors: There is also a strong relationship with surgery, such as the smoothness of the implantation, the depth and location of the electrode implantation, whether there are surgical complications, and whether the electrodes are damaged. 3. Cochlear implant products: The number of electrodes and the stimulation rate of the product will affect the effect, and it is also related to the speech signal processing scheme adopted by the speech processor. 4. Post-operative cochlear implant commissioning: This means deciding whether the cochlear implant is in an optimal working condition. 5. Post-operative rehabilitation: The means of post-operative auditory and speech rehabilitation and the time of rehabilitation is also a relatively important influencing factor. 6. Other factors: Whether the patient is used to using the cochlear implant on a daily basis, whether the patient does not rely on reading the mouthpiece, and whether the patient really relies on communicating through hearing through the action of the cochlear implant. Some research results show that the frequency and duration of cochlear implant use under the same conditions directly affect the efficacy, so patients are encouraged to wear cochlear implants regularly after surgery to promote recovery.