Abstract:Objective: To study the chemical constituents in roots of Heracleum rapula.Method: The constituents were isolated by column chromatography on silica gel and ODS,and identified by spectroscopic methods.Result: Nine compounds,osthol(Ⅰ),bergapten(Ⅱ),xanthotoxin(Ⅲ),isopimpinellin(Ⅳ),imperatorin(Ⅴ),isoimperatorin(Ⅵ),cnidilin(Ⅶ),phellopterin(Ⅷ),rivulobirin A(Ⅸ) were isolated and identified.Conclusion: Compounds Ⅵ,Ⅶ,Ⅷ,Ⅸ were isolated from this plant for the first time.