Aster is more effective when used raw to treat external coughs, more effective when used with honey to treat internal coughs, and can also be used with Platycodonopsis and Hypericum to strengthen the power of relieving coughs and resolving phlegm. Aster is a common clinical phlegm relieving cough and asthma (stop coughing, calm wheezing) one of the drugs, is the root and rhizome of the Asteraceae plant aster, in the clinic after slicing and raw or honey-roasted, have a better effect of cough. Aster for the treatment of cough, cough and phlegm and other lung diseases, can be a single decoction soup medication, which is used for external cough raw aster, internal injuries and long term cough more than the use of honey aster; single aster although cough phlegm asthma efficacy, but the effect is relatively poor; the treatment of external cough, can be accompanied by thorns, Platycodon grandiflorus, Baibu and other drugs; the treatment of internal injuries and cough, can be accompanied by zhebeimu, chuanbeimu and other drugs, cough phlegm effect will be better. Aster needs to be correctly used under the guidance of a professional physician, there is no clear adverse reactions and contraindications, with solid heat should be taken with caution.