Mouth-to-mouth artificial respiration is one of the basic skills of CPR operation and is an important method to provide oxygen delivery to the patient during hands-on CPR operation. In the process of operation, the rescuer should pinch the patient’s nose with one hand, in order to avoid air leakage from the nasal cavity in the process of artificial respiration, and push up the patient’s chin with the other hand to keep the airway open, and then after the rescuer breathes calmly, he or she wraps the mouth around the patient’s mouth and blows into his or her interior, and the blowing time is about one second. In the process of artificial respiration, the rescuer should pay attention to the patient’s thoracic movement, as long as the patient’s thorax rises during the blowing process. In addition, the process of artificial respiration should avoid rapid and excessive pressure blowing, to avoid the patient’s hyperventilation related damage. In the process of artificial respiration, the respiratory rate is generally controlled at 6-8 breaths/min and the tidal volume should be controlled at 500-600 ml.