The ratio of chest compressions to artificial respiration is 30:2. The ratio of chest compressions and artificial respiration during CPR is 30:2. Effective chest compressions and artificial respiration are the key to CPR and determine whether CPR can be effective. First of all, press the two nipple line and the sternal junction, the depth of compression should be ≥5cm, the frequency>100 times/min, open the airway to clean up the secretions in the oral and nasal cavity in time to avoid aspiration, and open the airway to help artificial respiration. Try to avoid interrupting chest compressions during the resuscitation process, and after artificial respiration, chest compressions should be performed immediately. Specific resuscitation as much as possible under the guidance of the doctor, such as the scene without medical personnel, in the resuscitation at the same time should promptly call the 120 emergency telephone.