The process of fracture healing is divided into the following three stages, the total time needed is 3 months, the specific process includes: the first stage is 2-4 weeks after the fracture, this stage is hematoma inflammation period, through the local hemorrhage hematoma fibrosis, so as to effectively reduce the local hemorrhage swelling, so that these hemorrhage swelling of the tissues undergoes fibrosis; the second stage is 4-8 after the injury, i.e., the primitive scab The second stage is 4-8 after the injury, i.e. the period of primitive bone scab formation, this stage through the membrane osteogenesis and cartilage osteogenesis of the two ways of osteogenesis, to form the primitive bone scab at the fracture, so as to complete the initial connection between the two ends of the fracture; the third stage is 8-12 weeks after the injury, this stage is the period of molding and transformation of the bone scab, through the molding of the primitive bone scab, so as to make the primitive bone scab’s strength and hardness can be restored to the original state of the fracture, so after this stage, clinical healing can generally be achieved. Therefore, after this stage, the clinical healing standard can be reached.