Abstract:To study the the saponins of Panax japonicus. Methods:Solvent extraction and preparative HPLC were used for separation, and their structures were identified by spectral analysis. Results:Five saponins were obtained and identified as Hemsgiganosides B (1), Chikusetsusaponin Ⅴ (2), IV (3), IVa (4) and Cynarasaponin C (5). Conclusion:Hemsgiganosides B (1) and Cynarasaponin C (5) were isolated from the plants of genus Panax for the first time.