Rabdosia Serra (MAXIM) Hara is a chinese traditional medicine for the treatment of hepatitis, enteritis, acute cholecystitis and dysentery. Rabdosia serra (Maxim.) H.Hara is a synonym of Isodon serra (Maxim.). Three new abietane diterpenoids which were assigned the structures of 16-hydroxyhorminone, 16-acetoxy horminone, and 6,12,15-trihydroxy-5,8,11,13-abietetriene-7-one were isolated, together with horminone, 16-acetoxy-7-0-acetylhorminone, β-sitosterol, stigmasterol, ursolic acid and palmitic acid from the leaves of Rabdosia serra (maxim) hara. A new abietane quinone diterpenoid was isolated, together with horminone, 16-acetoxy-7-0-acetylhorminone, β-sitosterol, stigmasterol, ursolic acid and palmitic acid from the leaves of Rabdosia Serra (MAXIM) Hara. The new compound was elucidated as 16-acetoxy-7α-ethoxyroyleanone.