Sun exposure is good for bone fracture, through sun exposure, the ultraviolet rays in the light can irradiate to the skin, so that the skin can synthesize vitamin D. After two times of activation by the kidneys and the liver, it becomes the active vitamin D3, i.e., 1,25-dihydroxyvitamin D3, which can promote the absorption of calcium in the intestinal tract. When more calcium is absorbed by the intestines, the amount of calcium in the blood increases accordingly. Calcium ions reach the bones through the blood circulation and are deposited on the bones, which results in more and better quality bone scabs in the fracture. The fracture resistance of the fracture place is enhanced, the fracture can reach clinical healing as soon as possible, and the patient can recover normal function as soon as possible, return to the society, and resume normal work and life, so the sunshine is good for the fracture.