Using Angelica dahurica (Fisch. ex Hoffm.) Benth. et Hook. f. as the experiment material, and using imperatorin and Isoimperatorin as the active constituent criterion, the broaden dynamic of xylem and phloemduringAngelica dahurica's growth and their relation with the contents of coumarin, the distribution of coumarin contents at Angelica dahurica's different part during different period, the contents dynamic of soluble sugar during different period, the influence on Angelica dahurica's yield and coumarin's ...