Abstract: Generally, there are many ways to repair bone defects. Such as bone auto grafts or bone allo grafts. But they all have many short comings and have been limitted in elinical using. So many other ways to treat the bone defect have been studied for a century. In this report. totall 12 cases of patients have been successful treated with periesteal pieces auto-graft in blood coagulum by the autors. The osteogenetic effects are found and bone defects repaired.