Abstract:By means of Bencaological study on traditional Chinese drugs Duhuo,Jiuyanduhuo and Qianghuo,ithas ben found out that the Duhuo recorded in earlier Bencao works should be Qianghuo,and Duhuo was first usedmedically in the South -Norih Wiiasty poried, whereas Jiuy-anduhuo‘s medical use started in the Ming besty.Raseurces of the three drugs were investigated and their niain species were found out.