The golden resuscitation time for cardiac arrest is 4 minutes, more than 4 minutes will have brain damage. The heart is a blood pumping organ, when cardiac arrest when the heart ejection function will suddenly stop, the whole body blood circulation is interrupted, loss of consciousness, respiratory arrest and other manifestations, and the brain and other vital organs of ischemia and hypoxia tolerance is poor, stop the blood supply time is too long will occur irreversible damage, and even life-threatening. Generally, after cardiac arrest, brain ischemia for about 10 seconds will lead to the patient’s loss of consciousness, generally ischemia for more than 4 minutes will begin to have different degrees of brain damage. Therefore, the golden resuscitation time for cardiac arrest is 4 minutes, and the success rate of treatment will be greatly reduced if it exceeds 4 minutes. It is recommended that everyone should learn basic first aid measures such as CPR to save the life of a person suffering from cardiac arrest and to be the first witness to life.