Severe deformity shortening of the lower extremity caused by trauma and developmental abnormalities often requires staged multiple surgeries in order to avoid neurovascular distraction damage if conventional surgical orthopedics is adopted. Nevertheless, complications such as shortened limb due to closed wedge osteotomy, delayed bone healing and bone nonunion due to open wedge osteotomy, osteofascial compartment hypertension syndrome, and insufficient orthopedic treatment can still occur. The application of Ilizarov technique for gradual correction breaks the limit of traditional method of lengthening and correcting angulation each time, reduces the risk of vascular nerve pulling injury and osteo-fascial compartment hypertension. It avoids the trouble of multiple hospitalizations and repeated surgeries in the past and saves medical resources and costs. This technique is developed by applying the theory of distraction-osteogenesis proposed by Dr. Ilizarov in the 1950s and the invention of the annular scaffold. The theoretical technique was introduced to our country in the late 1980s and early 1990s. A series of basic research results and observations have proved that DD application of continuous distraction-stress stimulation within physiological limits activates and maintains the regenerative capacity of tissue cells and promotes tissue regeneration. The above-mentioned phase I correction of angular shortening and rotational deformity of the lower extremity is achieved by applying a ring-shaped external scaffold designed for this theory to hold the corresponding bone segment firmly, and by installing hinges and distraction bars, the angular deformity between bone segments can be corrected and the bone can be lengthened at the same time, and the slow distraction promotes the successful regeneration and repair of bone and surrounding soft tissues. At the same time, this technique can also treat some serious trauma and difficult diseases that are difficult or impossible to treat with traditional concepts and techniques, such as bone discontinuity after trauma, large bone defects caused by tumors and infections, severe joint flexion contracture, fibrous stiffness, etc., congenital tibial pseudarthrosis, congenital clubfoot can be repaired by natural tissue regeneration using Ilizarov technique, avoiding the need for It avoids the microsurgical tissue grafting technique, thus reducing the difficulty and risk of surgery and making it easy to succeed. Therefore, this technique is safe, minimally invasive, with fewer complications, fewer operations, and a high success rate for the treatment of limb deformities.