The advantages of intramedullary fixation: 1, can control the axial force line of the fracture site, locking intramedullary nail can prevent fracture rotation deformity, reduce the risk of built-in fracture; 2, the use of closed and minimally invasive technology, reducing the rate of surgical infection; 3, reduce the destruction of periosteal blood flow, retain the osteogenic growth factors in the hematoma, expand the marrow debris with autogenous bone graft effect, muscle contraction to produce micro-motion to provide mechanical stimulation, etc. Factors to promote fracture healing; 4, central fixation, elastic fixation, stress dispersion to avoid stress masking effect, low incidence of re-fracture; 5, firm fixation can be early functional exercise and weight bearing; 6, internal fixation removal through a small incision, minimally invasive.