The indications for CPR are that cardiopulmonary resuscitation can be performed for various pathogenic factors causing cardiac arrest, and contraindications are only relative, but there are no absolute contraindications. It is generally believed that the resuscitation effect is poor in the following cases: 1. rib fracture, CPR after rib fracture, the fracture segment of the rib moves back and forth, which may cause further damage to the patient’s internal organs; 2. patients with heart rupture and pericardial hemorrhage, simple compressions may further aggravate heart damage; 2. traumatic hemopneumothorax, simple compressions may aggravate damage to the lung; 3. patients with advanced tumor, communicate with the family In-depth communication, avoid invasive treatment such as cardiopulmonary resuscitation.