By referring to materia medica books and modern literature,the author researched the name,origin,producing area,quality evaluation,harvesting and processing,processing methods,and treatment effects of Kudougen systemically.Kudougen is the dried root of Sophora alopecuroides Linn.,mainly produced in northern China,such as Inner Mongolia and Xinjiang.It is suitable to grow in calcareous soil with sufficient light and good drainage and can be harvested in summer or in autumn,with autumn harvesting and loose quality as the best.After harvesting,Kudougen is washed and cut into thin slices and dried for use.It is clinical mainly used for acute bacillary dysentery,enteritis,and so on.The results of the study can provide a reference for the clinical application and resource development of Kudougen.