Abstract: Eleven compounds were isolated from roots of Agastache rugosa and eight of them were identified as maslinic acid (Ⅰ), oleanolic acid (Ⅱ), 3- O- acetyl oleanolic aldehyde (Ⅲ), acacetin (Ⅳ), tilianin (Ⅴ), agastachoside (Ⅵ),daucosterol (Ⅶ) and β-sitosterol (Ⅷ). Compound Ⅸ is a new diterpenoid and its structure was proposed to be 19 (4→3 )abco- 11,14- dihydroxy- 12- methoxy- abieta- 8,11,13, 15- tetraen- 7- one based on spectral data, named dehydroagastol. The studies on Ⅹ and Ⅺ are in progress.