i Shou Tang was given to mice orally in the doses of 1g. 2g and 4g/kg scperately for 7 days. The activities of immunity and antistress wereexamined. The results showed that the swimming time and the endurancehypoxia in the 4g/kg group taking Yi Shou Tang were much longer than thecontrol group. Yi Shou Tang in the doses of 2g and 4g/kg improved theanticold activity. Morcver, YiShou Tang with the doses of 1g 2g and 4g/kg increased the serum hemolysin andphagocytic index but it had nosignificant effects on the de layed-type hypersensitivity.