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Equisetum hyemale L. (Latin scientific name: Equisetum hyemale L.), also known as: Qianfeng grass, filing grass, brush-brush grass, brush pot grass, elderberry, horse ginseng, etc. , is the whole grass of equisetum. Perennial evergreen herb, 30- 100 cm high. Rhizomes are short, dark brown and underground, with dark brown roots on nodes. The stem of Hypericum japonicum is erect, single or branched only at the base, 6-8 mm in diameter, hollow and jointed, with gray-green or yellow-green surface, 0-30 longitudinal ridges and grooves, and rough. Harvesting in summer, removing impurities, drying in the sun or in the shade, and slicing. Likes to grow in shady and humid places under forests on hillsides, and is easy to grow in river bank wetlands, streams or weeds. Location: Northeast China, North China, Inner Mongolia and Yangtze River valley. Equisetum is sweet, bitter and flat. It belongs to lung and liver meridians, and has the effects of dispersing wind and heat, improving eyesight and stopping bleeding.