Penthorum chinense is an authentic medicinal material in Gulin County, which is distributed in the virgin forest at the foot of Wumeng Mountain at an altitude of about 1000 meters. Its growth and survival have strict requirements on soil, sunshine, temperature and precipitation. Ganhuangcao was first seen in the Ming Dynasty's "Herbal Medicine for Saving Famine", which has the functions of clearing away heat and toxic materials, eliminating jaundice and removing dampness, promoting blood circulation and removing blood stasis, inducing diuresis and reducing swelling. It is the Miao people's experience in treating liver diseases, which has been used by Miao people for generations and is called "fairy grass". Modern research shows that penthorum chinense contains many effective components, which can protect liver injury, restore liver function, reduce the damage caused by drinking and drugs, inhibit liver fibrosis and cirrhosis, and have significant therapeutic effects on hepatitis A, hepatitis B and chronic active hepatitis.