Present invention firstly relates to a kind of extracts of plant, belong to composite family family, such as Dittrichia belongs to, it is essentially characterized in that including at least compound 12-carboxyeudesma-3, 11 (13) diene and/or one go hydroperoxide derivative with being used as antifungal agent, because it is obtained, according to including the dry fresh plant dipping of at least following steps, the solvent of dried plant selects water, alcohols, ketone, esters, ethers, chlorinated solvent, in hydrocarbon chain alkane and any above-mentioned solvent, or pass through supercritical fluid extraction combination cosolvent, the dry mixture, the operating temperature of the step is lower than 60 °C, the impregnation steps for being 1 with pH < < 10.Sourness
