Di Yu, Garden Burnet (Sanguisorba Officinalis) is distributed in the north temperate zone of Asia, throughout Europe and China. This plant grows in area at altitude of 30 meters to 3,000 meters. Garden Burnet is a perennial herb, 30 to 120cm in height. The root is stout, mostly fusiform, and rarely cylindrical. The root surface is brown or purple-brown, with longitudinal wrinkles, transverse cracks, and yellowish white or aubergine smooth transection. The stems are up straight, carinal, and glabrous or with sparse hairs on base. The fruits are concealed in the persistent calyx tube. The blooming and fruiting period is during July to October.