People found in cardiac arrest is recommended to immediately perform hands-only cardiopulmonary resuscitation on patients, and at the same time call for help, call the 120 emergency number, as follows: 1, the position of the patient, so that the patient lying flat, pounding 2-3 times in front of the patient’s chest, to see if the patient’s consciousness has recovered, if the patient’s consciousness recovery suggests successful resuscitation, waiting for the arrival of 120 emergency vehicles; 2, if the patient’s consciousness has not recovered, to carry out chest compressions, compression sites selected two nipple line midpoint, compression depth of 3-5 cm, compression frequency should be more than 100 times per minute, combined with artificial respiration, chest compressions 30 times should be artificial respiration twice; resuscitation process to observe the patient’s state of consciousness, the patient’s consciousness recovery suggests successful resuscitation; patient consciousness is not restored, before the arrival of the ambulance, to adhere to the chest compressions and artificial respiration; 3. If the place where the patient develops has electric defibrillation equipment, electric defibrillation can be performed.