Extracorporeal cardiac compression selects the midpoint of the two nipple lines as the compression site, requiring both hands to overlap up and down, pressing down on the sternum, making the sternum sink about 5cm or so, the heart is compressed by the skeleton will produce ejection of blood, the frequency of the compression is about 100 times/minute, and so the heart gradually recovers its beat. It is very important to choose the pressing part during the pressing process, if it is not chosen properly, it will lead to fracture, and the fracture may puncture the important organs, and the depth of pressing is also very important, if the pressing is too shallow, the heart can not be squeezed to complete the ejection of blood, it is suitable for the cardiac arrest caused by electrocution or drowning, and the chest compression is the only resuscitation measure, and the success of the compression resuscitation can be judged by touching the carotid artery, and the face will gradually recover blood color if the carotid artery resumes pulsating. If the carotid artery resumes pulsation, the face will gradually regain its blood color, suggesting successful resuscitation.