Objective:To study the effect of decoction,aqueous extract,ethanol extract,essential oil of Yunmuxiang on isolated intestinal smooth muscle of guinea pig and to find the material basis of Yunmuxiang which affact isolated intestinal smooth muscle of guinea pig.Methods:seeing the average amplitude of isolated intestinal smooth muscle of guinea pig of 3 minutes before and after the administration as an Indicator,using experimental system of BL-420F biological function,to observe and compare the effect of four of the Yunmuxiang extract on isolate...