Ouhuoxue Dan is a creeping herbaceous plant belonging to the family Lamiaceae and the genus Huoxue Dan. The stem is four diamond shaped, with a light purple red base; Leaf grass texture, nearly circular; The leaves are kidney shaped or kidney shaped circular, with a heart-shaped base; Umbrella inflorescence, forming a whorl shaped structure, calyx tube shaped, corolla purple, disk cup-shaped, style slender; Mature small nuts are not seen. The flowering period is in May. Ouhuoxue Dan is native to various countries in Northern and Western Europe, and is also distributed in Xinjiang, China. Ouhuoxue Dan is resistant to yin and prefers moisture. It grows best under semi shaded conditions in the forest, but slightly weaker under full day sunlight. It prefers fertile, loose, and well drained soil. The propagation method of Ouhuoxue Dan is through cutting or division propagation.