| The effect of exercise training on bone morphological structure, bone mass，bone mineral density of athletes and the difference among them，including physical strength resistance，endurance resistance, speed resistance, and flexibility resistance, is reviewed using literature research method. At present, researches about different projects on bone metabolism of athletes are not comprehensive enough. They mainly focuse on bone morphological structure, bone mass, and bone mineral density. Few studies discuss the underlying mechanism at the level of stem cells. |