Measures to prevent malignant arrhythmia include: 1. Identify high-risk subjects of malignant arrhythmia and take timely and effective measures to prevent the event. Such as myocardial infarction, chronic heart failure with severe left heart insufficiency, ventricular premature beats, ventricular tachycardia, ventricular fibrillation, on the basis of which the use of amiodarone, β-blockers, is still not able to prevent, it is recommended that the ICD implantation; 2, to maintain a stable emotional state, to avoid exertion, cold, diarrhea, fever, and other triggers, and to regularly take medication and review under the guidance of the doctor. For those who have ever had arrhythmia, or in cases where medication is not easy to control, it is recommended that patients undergo catheter ablation and assistive devices.