The ratio of chest compressions and artificial respiration is 30:2, 30 cardiac compressions with two artificial respirations, the frequency and magnitude of cardiac compressions should be mastered. The frequency of cardiac compressions should be between 100-120 times/min, the depth of compressions should be 5-6 cm, artificial respiration should master the relative essentials, mouth-to-mouth artificial respiration should be fully wrapped around the patient’s mouth and lips, see whether the patient’s chest is undulating, the time of blowing is greater than 1 second, and the time between two blowing should be greater than 1 second. Cardiac compressions in the process of cardiopulmonary resuscitation is an extremely important means of resuscitation, while mastering the essentials to focus on the posture of compressions, shoulder joints, elbow joints and wrist joints to form a straight line with the patient’s thorax vertical.