Objective To report clinical features and management of severe flap-related complications after cochlear implantations (CI) and discuss their treatment outcome. Methods Data from 1204 patients treated at the department of Otolaryngology-Head and Neck Surgery, West China Hospital, Sichuan University from January 2008 to December 2019 were analyzed, retrospectively. Patients with flap-related complications, especially severe flap-related complications, were identified and their clinical features, courses of treatment and outcomes were analyzed. Results 61 patients（5.1%） suffered from flap-related complications, including 12 cases（1.0%） of severe flap-related complications. All the 12 patients received at least one conservative treatment, and the implants were removed. 12 patients successfully received cochlear reimplantation in our department. Audiologic performances were stable or improved following reimplantation in all cases, and there is no different between ipsilateral and contralateral reimplantation.Conclusion Severe flap-related complications are a kind of complicated complications, with various causes and manifestations. Conservative treatment is often ineffective, and the implants need to be removed. All cases had satisfactory prognosis.