Abstract: In order to observe the effect of achyrathes bidetata blume capsule to prevent the leucopenia caused by cancer chemotherapy,the 45 patients were randomized in double blind test into three groups A.B.and C,in Which Group A and Group B were test groups and Group C was control group. The results showed that the total effective rate of Group A and Group B was 60.0%,while that of Group C was only26.7%(P<0.05).It is suggested that archyrathes bidetata blume capsule can prevent the leucopenia caused by cancer chemotherapy.