Cochlear implant is an advanced technique and applying worldwide. ENT Hospital of HCM City has been applying single channel cochlear implant since 1998 and multi-channel cochlear implant since 2000. Until June 2011, there has been 97 patients, in which, 8 patients with bilateral cochlear implants simultaneously. Range of age from 21 months old to 52 years old. There are 48 male cases and 49 female cases in this study. The number of prelingual deafness are 91 cases and 6 cases with postlingual deafness. Complications are facial paralysis and CFS leak which have good recovery. The success of this operation consists: careful selection of candidates, accessment CT Scan and MRI preoperation, well-trained and experience surgeon. The result is very good. Postlingual implanted patients have influently communicating after 1 year. The congenital deaf children can reach the result from fair to excellent after 2-3 years.