Moxa leaf oil of compositae ai (ArtemisiaargyiLevl. EtVant.) dry or fresh leaves of the volatile oil obtained by distilling main ingredients of terpinene alcohol - 4 and alpha terpinene alcohol, with other ingredients of this product, can be directly relax bronchial smooth muscle, the antigen, acetylcholine. In addition, there is an anti-drug effect, can inhibit the release of slow reaction substance (SRS-A), also has a certain expectorant effect. No cardiac side effects.