The position of chest compressions is customarily positioned at the midpoint of the line connecting the two nipples, but the position of the nipples differs due to differences in gender, age, height and weight. According to the anatomical site positioning, the correct position for chest compressions is the middle and lower 1/3 of the sternum. The frequency of compressions is 100-120 times per minute, the depth of compressions is 5-6 cm, and the ratio of chest compressions to artificial respiration is 30:2. During compressions, the elbow joint, wrist joint, and shoulder joint are in a straight line, perpendicular to the patient, and the gravity of the body is used to press the patient’s chest downward with the shoulder joint as the center, and each compression should make the chest fully rebound before the next External chest compressions.