Objective:Patients with chronic heart failure suffer high risk of sudden cardiac death(SCD),which has been proved to be efficiently prevented by implantable cardioverter defibrillator(ICD). There have been multiple guidelines proposing indications of ICD implantation for primary prevention of SCD. The number of ICD implantations in China is small and unsatisfying ,for various reasons. Actions should be taken in propaganda so that this therapy is better known by the public,or at least patients with higher risk of SCD than currently indicated(ie,those with class I indications concurrently with syncop or presyncope,or with lower LVEF,or with unsustained ventricular tachycardia,or with frequent premature ventricular contractions) should receive ICD therapy without delay.