Fracture, osteoarthritis and serious osteoporosis can use bone peptide for injection, as follows: First, fracture: when the fracture of limb occurs, after manipulation, plaster reset fixation, splint fixation and incision reset plate screw internal fixation to keep the fracture end stable, the use of bone peptide for injection can promote fracture healing and reduce local inflammation and edema. Secondly, osteoarthritis: if patients suffer from osteoarthritis, they will have joint pain, limited joint movement and even joint effusion, at this time, the use of injectable bone peptide can eliminate joint inflammation, improve bone metabolism and relieve the symptoms of joint pain. Thirdly, serious osteoporosis: the patient has serious osteoporosis, through injectable bone peptide can improve bone metabolism, enhance bone density and fight against osteoporosis. Generally, bone peptide for injection is used only in the above cases.