Objective To observe and compare the diaphoretic function of Guizhi（Cinnamon twig）and Guizhi Decoction（decoction of Cinnamon twig）to explore the connotation of compatibility in Guizhi Decoction.Methods SD rats were divided into the blank group

Guizhi group

and Guizhi Decoction group

20 in each.They were given normal saline

Guizhi

and Guizhi Decoction respectively through intragastric feeding in equal amount for 30 minutes.The number of sweat secretion spots in the posterior sweat glands of’ toes

and the quantity of sweat secretion in the posterior sweat glands of’ toes were observed.Results The number of sweat secretion spots and the quantity of sweat secretion in the posterior sweat glands of’ toes in the Guizhi group was significantly more than that of Guizhi Decoction group and in the blank group（P<0.01）.Conclusion The diaphoretic function of Guizhi was obviously better than that of Guizhi Decoction.