There are three clinical methods of artificial respiration, mouth-to-mouth artificial respiration is the most common, followed by mouth-to-mouth-nose, mouth-to-nose artificial respiration. As for mouth-to-nose artificial respiration, it is usually taken when the patient’s mouth is tightly closed and there is no way to pry it open. Mouth-to-nose artificial respiration is most suitable for children or newborns. Because the mouths of children and newborns are smaller, artificial respiration may cause differences in mutual ventilation because of the asymmetry in size. Mouth-to-mouth-nose artificial respiration is more effective and more efficient in improving the oxygenation status of the patient, and is the most important way of artificial respiration for infants and children.