Objective: Effects of keumengja extracts on the blood picture in rat were determined. Results: Values of RBC, PCV and Hb showed a high in keumenja groups, however the values of PCV and Hb showed no significantly different in keumenja groups. Counts of WBC showed no significantly different in all treatment groups. In the composition of WBC neutrophils showed a tendance to decrease in keumengja groups, however these values showed no significantly different. Lymphocytes showed a high portion in keumengja groups and this portion showed a tendance to increase to increased concentration of keumengja. The portion of monocytes and basophils showed no significantly different in all treatment groups. Eosinophils showed a tendance to decrease in keumengja groups.