Children are not a smaller version of adults, and their limb fractures have their own characteristics and cannot be treated exactly according to adult treatment methods. Protecting the epiphysis from damage and the blood supply to the bone from being destroyed are two prerequisites that must be considered in treating long bone fractures of the limbs in children. The elastic nail is inserted from 1.5-2.cm away from the epiphyseal plate and operates against the epiphyseal plate without harassing the epiphysis, and the fracture is mostly reset by closed reduction or small incision, which causes less damage to the surrounding tissues. The structure and material of the elastic nail are different from the traditional Ender’s nail, and its rounded elbow provides convenience for the bending of the nail in the medullary cavity and smooth passage of the fracture end during closed reduction. It is characterized by small trauma, simple surgical operation, satisfactory fracture repositioning, effective fixation, few complications, no injury to the epiphysis, and short hospital stay. This technique has been widely recognized by pediatric orthopedic surgeons worldwide as the method of choice for treating long bone fractures in children.