Abstract:The effect on heart rate and DβH activity of rats fed with cold and hot natured decoction was studied, results: the cold prescription 1(Rhizoma Anemarrhenae, Radix Gentianae, Cortex Phelodendri, Gypsum Fibrosum), cold prescription 2 (Rhizoma Anemarrhenae, Cortex Phelodendri), cold prescription 3 (Rhizoma Anemarrhenae, Gypsum Fibrosum) and cold prescription 4 (Rhizoma Anemarrhenae) made the heart rate and DβH activity in adrenal gland decrease. The DβH activity of blood and brain in cold prescription 1 group decreased also. Hot 1 decoction (Radix Aconiti Praparata, Rhizoma Zingiberis, Radix Glycyrrhizae) made the heart rate and the DβH activity in blood, adrenal gland and brain stem of rats increase.