Abstract: Cladonia furcata is Cladonia furcata genus Cladonia furcata section’s lichen in lichens plants, Usnic acid is one of its main ingredients. Based on the experimental evidence, Usnic acid soluble in chloroform and acetone, and Usnic acid with KOH react show yellow in Lichens’s color reaction; Usnic acid add the mixture of KOH and NaCl react show dark-yellow. Usnic acid show yellow oblique prism crystallization in the acetone liquors, and in the methanol solvent show yellow needle crystallization, and in the ethanol solvent show yellow needle crystallization. Using the benzene-ethanol mixtures (l:1) can make the compound is extracted from the Methanol and ethano, and can obtain pure crystallization of usnic acid. By measuring the active ingredients of Cladonia furcata, we can know that such plants for the future of application development will provide a scientific basis.

Key words: Cladonia furcata, active ingredients, obtain