Glucosamine,referred to as Glc N,is a product in which one hydroxyl group of glucose is replaced by one amino group. Glc N is widely present in plants,animals and microorganisms. After research,ammonia sugar has a good effect on the treatment of osteoarthritis,the suppression of cancer,and the recovery of cognitive impairment caused by hypoxia in some animals. This article summarized the application of Glc N in the medical field,and lays a foundation for the further development of Glc N in the field of biomedicine.