The golden time for resuscitation of sudden cardiac death is 4-6 minutes, beyond which irreversible damage to the central nervous system will occur. If sudden cardiac death occurs in an organism, the optimal resuscitation time is 4~6 minutes. The heart ejection function stops, blood flow is interrupted, the patient will have loss of consciousness, ischemia of organs, lack of oxygen, necrosis of brain cells, resulting in irreversible damage to the central nervous system, and will lose the opportunity to resuscitate. Patients with sudden cardiac death, should determine their consciousness, breathing, pulse, tap the shoulder to call out, touch the carotid artery pulsation disappeared, no spontaneous respiration, immediately carry out cardiopulmonary resuscitation, chest compressions, and once again determine the patient’s consciousness. Patients with sudden cardiac death, call 120, and should immediately perform CPR to save lives.