In 2012, an outstanding college student died suddenly from cardiac arrest on the roadside in Beijing, and none of the people who passed by the scene knew CPR, indicating that national first aid quality education needs to be strengthened urgently. In the United States, as early as the 1980s, emergency medicine has been incorporated into the compulsory courses for medical students; in Japan, the earthquake came, how to protect and reduce injuries, even elementary school students know. In today’s society, competition is fierce, study, work and life are stressful, accidental injuries and deaths are common, therefore, mastering CPR is beneficial to all. Now introduce the chest cardiac compressions. First of all, to determine whether the casualty responds, use the method of “shaking” or “screaming”, and ask loudly in his ear, “What’s wrong with you?” If there is no response, immediately feel his pulse (can be 2 fingers together to touch the carotid artery), to understand whether there is a pulsation, if not, immediately perform cardiac compressions, can first slightly elevate his lower extremities to facilitate venous blood return to supply the myocardium, the rescuer is best to stand or kneel on the right side of the casualty, the left hand palm root flat on the middle and lower 1/3 junction of the sternum (if you can not accurately determine the location, the simplest way is to find the two nipple line (If the site cannot be accurately determined, the easiest way is to find the midpoint of the line connecting the two nipples. Place the root of the right palm on the back of the left hand, cross the fingers of both hands, overlap the roots of the palms in the same direction, fingers straight or interlocked, palms cocked, shoulders directly above the sternum of the patient, upper body leaning forward, with the weight of the rescuer’s body, the shoulders, arms and elbows in a straight vertical downward pressure. Pay attention to the smooth and regular compressions, at least 100 times / minute, pay attention to the effective compressions (that is, press down and wait for the natural rebound of the thorax before repeating the second time). If the compressions fatigue, should be replaced by another person to continue to rescue. I hope that the general public to raise awareness of public morality, common participation in rescue, even if to help call 120 is also good.