Objective: To work out a qualitay standard of Radix Angelicae dahuricae.
Method: TLC and HPLC were adopted.
Result: Four coumerin compounds were identified by TLC, and the contents of two compounds were determined by HPLC.
Conclusion: Imperatorin, isoimperatorin, byakangelicin and oxypeucedaninhydrate can be found simultaneously in Radix Angelicae dahuricae. The contents of imperatorin and isoimperitorin are not lower than 0.1% and 0.04% respectively.