Alpha1-acid glycoprotein (AGP), also known as oral mucus protein (ORM), is an acute phase positive protein. AGPs have various biological activities, such as drug transport, immune regulation, maintenance of capillary barrier, regulation of lipid metabolism, etc. AGP mainly exists in liver cells, but it is also expressed in other tissue cells, such as adipose tissue, brain tissue, endothelial cells and immune cells. This article mainly reviews the application of AGP in pulmonary diseases, and the role,significance and related new developments in different systemic diseases.