Aim: To study the antitumor activity of Isodon excisoides extracted by diethyl ether or ethyl acetate. Methods: Using diethyl ether or ethyl acetate as the extracted solvents,the vitro cytotoxicity on HepG2,EC9706,and TPC-1cells was conducted based on the above kinds of extracts by MTT method. Results: The proliferation inhibition rates of three kinds of tumor cells induced by two Isodon excisoides extracts were different( P < 0. 001). The extracts of diethyl ether and ethyl acetate had different IC50 of He...