CPR is an abbreviation for cardiopulmonary resuscitation. When the heart stops suddenly, if it is not resuscitated and resuscitated immediately and in a timely manner after 4-6 minutes, it can cause irreversible damage to the patient’s brain and other vital organs and tissues of the body, so CPR must be performed immediately at the scene after cardiac arrest, which is different from cardiac arrest in the end stage of any chronic disease. If effective resuscitation measures are taken in a timely manner, the patient has the potential to be saved and to recover. Valuable time is gained for further resuscitation until the life of the casualty in cardiac arrest is saved.