PROBLEM TO BE SOLVED: To provide a chest compression system capable of lessening pressure irregularities caused by the difference in capacity of a person who attempts to put pressure on the chest and providing a constant pressure (constant pressure speed and intensity) to the chest.SOLUTION: The chest compression system for putting pressure on a chest of a human body, comprises: a supporting frame which is formed to surround the chest; and a main body which is formed in an upper end of the supporting frame, applies pressure to the chest from a set position by external force, and performs a reciprocating motion to be restored to the set position after pressing the chest.SELECTED DRAWING: Figure 2