1.Promote swelling reduction, prevent joint capsule contracture, joint adhesion and stiffness. 2.Promote fracture healing: repeated stretching and contraction activities of the muscles of the affected limb can strengthen the longitudinal compression of the fracture end, the fracture gap will become smaller, and the fracture part will have better contact, which can stimulate the activity of bone cells and facilitate fracture healing. 3. Promote blood circulation and prevent thrombosis.4. Early functional exercise of the limb can reduce and prevent bone loss, and muscle atrophy and other fracture complications.5. For intra-articular fractures, early functional exercise can stimulate cartilage repair and restore the flatness of the joint surface through mutual extrusion and friction between the cartilage surfaces of the joint.6. Promote the functional recovery of the respiratory system, digestive system and cardiovascular system It can promote the blood circulation of the whole body and the physiological function and metabolism of each system organ, thus preventing complications such as pneumonia, pressure sores, urinary tract infection or stones, venous thrombosis, constipation, etc. It can also improve the patient’s mood and enhance the patient’s confidence in recovering health as soon as possible.