Abstract:The rectal temperature(Tr)and heart rate(HR)of three groups of New Zealand white rabbits, i. e.thyroidectomized(G1), thyroidectomized and treated with Chinese herbs (a decoction composed of tonifying kidney-yans herbs i(G2)J and pseudothyroidectomized for control (G3),were observed dynamically for 26 hours. The resultsindicated that the Tr and HR in G1 were decreased, and the circadian rhythms of the Trand HR disordered signifi-cantly, while these changes in G2 were corrected obviously.