To understand cochlear implant surgery, we must first understand the structure and components of a cochlear implant. The cochlear implant is composed of four parts: the cochlear implant electrode, the speech processor, the directional microphone and the transmission-receiving device, which are divided into an in vivo part and an extracorporeal part. Simple surgical steps include: 1. Incision: At present, our department adopts small incisions for minimally invasive surgery, which does not increase the operating time and makes the post-operative area beautiful and reduces the complications of skin flap necrosis and infection. The 75px incision behind the ear, about 25px above the mastoid tip and about 25px behind the postauricular sulcus, is used to cut the skin and subcutaneous, exposing the myofascial and bone flap; 2. 3. Open the facial nerve fossa: cut the facial fossa between the facial nerve and the bulbar nerve to expose the round window niche; 4. Expose the round window membrane or cochlear window: make the “cochlear electrode implantation hole” in front of the round window niche or in front of the lower bulbar. 5. Prepare the bone groove for the stimulator: the extent of bone grinding can be determined according to the implant; 6. Implant the cochlear electrode: implant the cochlea through the round window or cochlear implant hole; 7. Suture the incision: suture the periosteum, subcutaneous and skin layer by layer for a total of three layers; 8. Apply pressure dressing to the ear: remove it in 2-3 days, change the medication as appropriate, and remove the stitches in 7-10 days. Prophylactic application of antibiotics for 3-5 days.