There are several precautions after intramedullary nail surgery; first of all, we should try to avoid fat embolism syndrome, because the intramedullary nail surgery is intramedullary fixation, which will lead to an increase in intramedullary pressure, and the adult medulla is yellow bone marrow, which is essentially fat, after the increase in pressure, the fat may enter the blood and produce fat embolism syndrome, so we must closely observe the blood oxygen concentration after surgery to avoid Therefore, the blood oxygen concentration must be closely monitored after surgery to avoid the development of fat embolism syndrome. Secondly, after intramedullary nailing surgery, the distal locking nail should be removed within a certain period of time to dynamize the nail and promote bone healing and allow pressure on the broken end, but distal dynamization is not suitable for the upper extremity. Finally, after intramedullary nailing surgery, attention should be paid to other complications such as deep vein thrombosis in the lower extremity, crushing pneumonia, and decubitus ulcers.