The methods of adult CPR include 3 main areas, referring to chest compressions, artificial respiration and electrical defibrillation. Cardiopulmonary resuscitation is a series of life-saving methods to be performed after the patient’s heartbeat and breathing have stopped. External chest compressions are performed with the patient in a flat position, at the midpoint of the line between the nipples, at a depth of at least 5 cm, and at a frequency of 100-120 compressions/min. After 30 compressions, two artificial respirations should be given, which is the process of chest compressions and artificial respiration, as well as single-person hands-on resuscitation. If the environment has an external automatic defibrillator, electrical defibrillation should be performed as early as possible. The external automatic defibrillator will have a rhythm recognition process and prompt discharge process, which is simple and easy to operate. If a defibrillator is not available, adult CPR involves only the first two methods, which are chest compressions and artificial respiration. Chest compressions and artificial respiration are performed continuously until a professional is present, in a ratio of 30:2.