There are many benefits of putting on a cast after a fracture, mainly in the following aspects: first, to promote the healing of the fracture, after a fracture, the fracture end can only heal slowly with stable fixation, and the cast fixation is more reliable than the brace or small splint fixation. Secondly, it can relieve the pain very well. After the fracture, as long as the fracture end is moved slightly, the stimulation effect on the surrounding tissues will produce severe pain, after fixing the fracture end, the whole pain will disappear a lot. Thirdly, even if the fracture is decided to be treated surgically, temporary cast fixation can relieve the pain and at the same time, it can well avoid the tension of the surrounding muscles and produce further dislocation of the fracture site, which can well facilitate the reset of the fracture during surgery and shorten the recovery time of the fracture after surgery.