The invention relates to an application of xanthostrumarin extractive, wherein said xanthostrumarin extractive comprises diterpene compound, phenolic acid compound and other extractives while their contents are 0.5%-99%, 0.5%-99%, and 0.5%. And the production uses general extraction, separation and purification. The extraction is solvent extraction method; the separation and purification uses solvent extraction method and porous adsorption resin method. The inventive extractive can treat coryza, nasal sinusitis, etc. It has simple production and stable property.