The two fracture ends are not restored to the normal anatomical relationship after the reduction, but the fracture healing has no significant effect on the function of the limb is called functional reduction; the fracture ends are restored to the normal anatomical relationship through the reduction, which is called anatomical re-dislocation. 1. Functional reduction: after reduction, the two fracture ends are not restored to the normal anatomical relationship, but does not affect the function; the criteria are: ① rotational displacement of the fracture site, separation displacement must be completely corrected. The criteria are: ① rotational displacement of the fracture site, separation displacement must be completely corrected. ② angular displacement must be completely reset. ③Transverse fracture of long bone stem, the fracture end should be at least 1/3, and metaphyseal fracture should be at least 3/4. 2. Anatomic restoration: When the fracture ends are restored to normal anatomical relationship through restoration, and the alignment (contact surfaces of the two fracture ends) and alignment (relationship of the two fracture segments on the longitudinal axis) are completely good, it is called anatomic restoration. Functional reduction can be achieved by manipulative reduction, which is common in elderly and frail patients or those who do not require anatomical reduction; anatomical reduction mostly requires surgical incision, and intra-articular or metaphyseal fractures require mandatory anatomical reduction; surgical incision is also required to achieve anatomical reduction in unstable fractures that are poorly reduced by manipulation. Anatomical reduction is the most ideal, but clinically the correct treatment should be taken according to the patient’s specific situation.