Angelica flaccida Kom. is a herbal plant growing wild in the marsh of valley in Korea. It has been used for sedative and analgesic as a folk medicine, but its constituents have not been clarified yet. Five known coumarins such as isoimperatorin, decursidin, (-) anomalin, decursin, decursinol and two sterols such as ${eta}-sitosterol$ and stigmasterol were isolated from the root of this plant, Their structures were identified by the UV, IR, NMR, mass data and the physico-chemical properties.