[Objective] The research aimed to screen out the leading soil factors that affected the active components in Eucommia ulmoides.[Method] The content of chlorogenic acid and flavonoid active components(rutin,quercetin and kaempferol) in the leaves of E.ulmoides from different producing areas of Guizhou were determined by HPLC.The statistical analysis was made on the content of active components in the leaves of E.ulmoides from different producing areas of Guizhou and the content of soil nutrients by using SPS...