ABSTRACT Before or after ,226,Ra irradiation with LD 50/30, mice were administrated with alcoholic soluble portion of Schizandra Chinensis Baill. In therapeutic group, survival increases to 80% and average survival time of died mice increases from 10.5 to 15 days. In prophylactic group, survival increases to 68.4% only. The activity of nervous system of irradiated mice is normalized by this portion.,Whether therapeutic or prophylactic group of whole body irradiation of mice with ,60,Co in 1070 rad, the antioxidation activities of liver and brain are increased by Schizandra Chinensis Baill extracted in boiling water. The antioxidation activities in therapeutic group are higher than that in prophylactic group.,The rough purified material of Schizandrin and pure γ-Schizandrin are able to increase the antioxidation activities of liver and brain to against ahe lipid peroxidation.