Xie Bai (Allii Macrostemonis Bulbus) contains a variety of constituents,including volatile oils,saponins,nitrogen-containing compounds,acids and so on.It is not only the important drug used for the clinical treatment of thoracic obstruction but also a commonly used drug for the treatment of diarrhea.Also,it has a high medical value which has been studied by various researches.In this paper,the source of crude drug,the chemical components,the pharmacological actions,and the historical development combined with other drugs of Allii Macrostemonis Bulbus were sorted out and summed up through reviewing relevant literature and books.This paper can provide new ideas for further research in Allii Macrostemonis Bulbus.