Severe deafness and above is a disease that seriously affects the daily life of patients, and especially for sensorineural deafness of severe severity and above, ordinary conservative treatment with medication cannot improve hearing, and only cochlear implants can rebuild hearing. Lifelong deafness caused by congenital deafness in children is a heartbreaking event for families and society. A cochlear implant is a semi-implantable medical electronic device that has two parts: an in vivo and an in vitro part. The cochlear implant is a surgical installation of the internal part of the implant into the patient’s body. After the incision has healed, the cochlear implant is then worn with an external speech processor and the patient can hear again. Since 1977, when the world’s first multichannel cochlear implant was implanted in Vienna, Austria, the procedure has been used successfully in clinical practice for nearly 40 years and is now well established and widely performed around the world. More than 400,000 people worldwide have regained their hearing through cochlear implants. Although cochlear implantation has become widespread in clinical practice, it is still a highly specialized field that requires a series of preoperative examinations and assessments, including audiological examinations, imaging examinations, and learning ability assessments, in order to make a clear diagnosis and determine whether a patient is suitable for implantation.