To conduct systematic research on avascular necrosis of femur. Methods: Analysis was conducted on medical reports on avascular necrosis of femur published during the recent decades of years. Results: The majority of scholars at home and abroad gradually re cognized the methods of remaining the head of femur when treating avascular necrosis of femur. The current well accepted therapies included arthroscopic therapy, extracorporeal shock wave, shock wave therapy and hyperbaric oxygen, core decompression, bone grafting, osteotomy, etc. Conclusions: Along with the development of modern science and technology, as well as the growing idea of remaining the head of femur, the combination of a variety of therapies will be more efficient to alleviate the patient's symptoms, and delay or terminate the process of necrosis, which would be a new hotspot for the research of curing the disease.