Judgment of the patient’s cardiac and respiratory arrest, chest compressions, open airway and artificial respiration are the four major components of the basic life support phase of CPR operation. To achieve high-quality CPR operations, there should be timely and accurate judgment of the patient’s heartbeat and respiratory arrest. Once the patient reaches the resuscitation indication, the corresponding resuscitation operation should be started immediately. In addition, in order to ensure high quality chest compressions, in addition to the adequate rate and magnitude of compressions, the patient should have adequate rebound of the thorax after each compression, and must ensure that the compressions are The number and duration of interruptions of compressions should be minimized. If multiple people are administered, they should be rotated as much as possible to avoid fatigue that could affect the quality of compressions. During airway opening, if the basic airway opening techniques do not open the patient’s airway effectively, the cause should be promptly identified, including clearing the patient’s mouth of solid foreign bodies. In the process of artificial respiration, the rescuer should inhale calmly and then blow the patient for about one second, as long as the rescuer observes the patient’s chest augmentation, avoiding excessive and rapid pressure ventilation, which may cause hyperventilation. In addition, during the basic life support phase of CPR operation, because the patient does not have an advanced artificial airway established, compressions and ventilation should be performed at this time according to the principle of 30:2 ratio of compressions to ventilation, and 30 chest compressions should be performed prior to ventilation. The patient should be treated with early electrical defibrillation when conditions permit.