Abstract:The experiment shows that high concentration of Aster tataricus plus Glycyrrhiza uralensis Fisch. can inhibit the tracheal systoliea caused by histamine, but for tracheal systoliea caused by acetylcholine the inhibition is indistinct. The experiment also shows that Aster tataricus, glycyrrhiza uralensis and Tussilago farfara L. combined have coordinated inhibiting effect on the tracheal systoliea caused by histamine and acetylcholine.