Abstract:The comparative toxicological researches on crude and processed drugs show that the activating actionof Radix Kansui,Radix Achyranthis Bidentatae and Semen Armeniacae Amarum on EBV-EA can be decreased by pro-cessing. Processing can also decrease. stimulating activity on mouse skin,inhibit tuinor-pronioting activity in two stageskin tumor promoting test and lapactic effect by Radix Kansui. Meanwhile the pharniacological effects of these drugscan be ratained or increased by processing.