The efficacy of the herb is to remove water and dampness, remove blood stasis and relieve pain (remove blood stasis to relieve pain), can be used to treat jaundice, edema, bruises, swelling and pain, can be decocted and taken internally or crushed and used externally. Cu Huang Cao is the whole grass of Cu Huang Cao (赶黄草), which is sweet in taste and warm in nature, and belongs to the liver and kidney meridians. When treating dysuria, it can be used with plantain; when treating heatstroke and thirst, it can be used as a tea; and when treating water-dampness and yellow swelling, it can be used with rock-bean vine root, urushiol root, and mountain pepper root. Catch yellow grass is a kind of Chinese medicine, need to be in the physician under the guidance of the identification of other Chinese medicines, not blindly take, in order to avoid adverse reactions.