[Objective]The present experiment was conducted to investigate the flavonoid content change in stems and leaves during different phenophases of Bupleurum scorzonerifolium Willd in order to find out the proper time and plant part for flavonoid extraction.[Method]UV vis-spectrophotometry method was used to determine flavonoid content in different organs of Bupleurum scorzonerifolium Willd,and their change trend during different phenophases was compared.[Result]Among different organs of B.scorzonerifolium,the ...