Elderly people suddenly unconscious, should first make the patient lying down, shouting the patient, to determine the condition of the unconscious person. If there is voluntary breathing and heart stop, should clean up the mouth and timely CPR, while calling others to dial 120; if the breathing and heartbeat is stable, should promptly call 120 for medical treatment. If the patient is unconscious, spontaneous respiration stops, carotid artery pulsation disappears, the patient is judged to have cardiac arrest, CPR should be given promptly and call 120. if the patient is in ventricular fibrillation and has the conditions for electric defibrillation treatment, electric defibrillation should be performed in a timely manner (follow the prompts of the AED to operate). If the patient is unconscious with spontaneous respiration and heartbeat, call 120 for treatment and avoid moving the patient to minimize secondary injury. In summary, the elderly suddenly unconscious, need to calm treatment, contact 120 as soon as possible, by professionals to give effective rescue measures.