To investigate the antiox idant effect of Tiandi Tang to mice testide mitochondrion.METHOD:D-g alactose-induced model senile mice was used,giving Tiandi Tang extracts,measuri ng the activities of GSH-Px,Na+,K+-ATPase and the content of MDA of testid e mitochondrion.RESULTS:Polar extracts of Tiandi Tang had antioxidan t action.CONCLUSION:The effect of Tiandi Tang polar extracts was one of the main mechanisms of antiaging.