1. Binaural severe and extremely severe sensorineural hearing loss;

2. Wearing appropriate hearing AIDS, after 3 ~ 6 months of hearing rehabilitation training, the auditory language ability has not been significantly improved;

3. No surgical contraindications;

4. Implanters and their families are interested in artificial ears;

5. Have a correct understanding and expectation of bugs;

6. Have the educational conditions in hearing and speech rehabilitation;

7. Cochlear morphology, no auditory nerve loss.

Implant object:

1. Pure tone listening is greater than or equal to 90 decibels;

2. Patients with congenital or acquired hearing loss can be treated;

3. Infants, teenagers and the elderly can be used;

4. Severe tinnitus;

5. Patients with unilateral hearing loss.