Contraindications to chest compressions are mainly the following: 1, rib fractures, if there is a traumatic rib fracture, continue to do chest compressions may displace the fracture end, displacement may be obvious to stab the chest organs, such as the heart, lungs; 2, heart injury, if there is a heart rupture or heart compressions, continue to do chest heart, compressions will make the situation of the injured heart more serious, must be urgent Open chest, do intrathoracic cardiac compressions; 3, lung injury and traumatic hemopneumothorax, if these conditions exist, continue to do extrathoracic cardiac compressions, may make the lung injury and hemopneumothorax situation aggravated, not conducive to recovery; 4, advanced tumor or multi-organ failure patients, do extrathoracic cardiac compressions is not very meaningful, usually not recommended.