Fracture recovery is a chronic process is mainly divided into three periods: 1, hematoma formation mechanization period, after the fracture due to the fracture end and the destruction of the surrounding tissue hemorrhage, the formation of hematoma, hematoma fibroblasts within the proliferation of active, thus gradually connecting the fracture end of the hematoma gradually mechanization, this period will last two to three weeks. 2, the original bone scab formation period, with the extension of the time of the mechanization of hematoma gradually calcification, gradually become the original bone scab, in a month and a half to two months or so X-ray can see the formation of the original bone scab, this period will exist two to three months. Calcification of the hematoma with the prolongation of time, gradually changed into the original bone scab, in one and a half to two months or so to take X-ray film can see the formation of the original bone scab, this period to exist two to three months. 3, the bone scab molding and shaping period, the bone is along the direction of the growth of the stress, in the stress concentration of the place of osteoclasts are more active, the formation of the bone scab is more obvious. And the activity of osteoclasts in the area where the force does not exist will lead to partial resorption of the bone scab, and this period exists for at least three months.