目的：对新种太白木（ＡｒａｌｉａｔａｉｂａｉｅｎｓｉｓＺ．Ｚ．ＷａｎｇｅｔＨ．Ｃ．Ｚｈｅｎｇ）根皮的皂苷成分继续进行研究。方法：利用硅胶柱层析和高效液相层析进行分离，根据皂苷的理化性质和光谱数据鉴定其结构。结果：得到３个化合物，分别确定为齐墩果酸２８ＯβＤ吡喃葡萄糖苷（Ⅰ），３ＯβＤ吡喃葡萄糖醛酸丁酯齐墩果酸２８ＯβＤ吡喃葡萄糖苷（Ⅱ）和３ＯβＤ吡喃葡萄糖醛酸癸酯齐墩果酸２８ＯβＤ吡喃葡萄糖苷（Ⅲ）。结论：皂苷Ⅱ和Ⅲ为新化合物，分别命名为太白木皂苷Ⅳ（ｔａｉｂａｉｅｎｏｓｉｄｅⅣ）和太白木皂苷Ⅴ（ｔａｉｂａｉｅｎｏｓｉｄｅⅤ），皂苷Ⅰ为首次从该植物中分得。 Objective: To study the saponin content of the root bark of Aralia taibaiensis Z.Z. Wanget H.C. Zheng. Methods: The compounds were isolated by silica gel column chromatography and high performance liquid chromatography. The structures of the saponins were identified by their physicochemical properties and spectral data. RESULTS: Three compounds were identified as oleanolic acid-28-O-beta-D-glucopyranoside (I), 3-O-beta-D-glucuronopyranosyl glucoside-oleo Acid28OβDglucopyranoside (II) and 3OβDglucuronopyranosyloligosaccharide28OβD-glucopyranose Glycosides (III). CONCLUSIONS: Saponin II and III are new compounds. They were named Taibaienoside IV and Taibaienoside V respectively. Saponin I was isolated from this plant for the first time.