The principle of cardiopulmonary resuscitation (CPR) is to restore the heartbeat through chest compressions and to restore the respiratory rhythm through artificial respiration. Cardiopulmonary resuscitation (CPR) is a common emergency measure used when spontaneous breathing disappears and pulse is lost. After clearing the oral and nasal airways of foreign bodies, chest compressions and artificial respiration are performed alternately to urge the patient to restore the heartbeat and spontaneous respiratory rhythm. Chest compressions can apply external force to the heart, prompting the blood in the heart to be pumped out under pressure, promoting the restoration of blood circulation and helping to revive the patient’s heart rate. Artificial respiration can blow air into the patient’s lungs when the patient is not breathing voluntarily, and then retract and expel it under the force of gravity. Repeating this process allows the exchange of gases in the lungs to be replaced, and prevents the patient from suffocating.