Aster has the effect of moistening the lungs and lowering the qi (moisturizing the lungs and making the upward lung qi descend), resolving phlegm and relieving cough, it can be used in the treatment of cough, coughing up blood with labor and has no clear side effects, it should be used with caution in those who have dry cough with yin deficiency and have solid heat. The contraindications are evil Tianxiong, Qu Mai, Lei Puan, Yuan Zhi, Ligustrum, and fear of Artemisia Incarnata. The drug source of Aster is the dried root and rhizome of Asteraceae, which is pungent, bitter and warm in nature, with the efficacy of moistening the lungs and lowering the qi, resolving phlegm and relieving cough, and is often used in the treatment of new and prolonged cough, laborious coughing and coughing up blood, and coughing up phlegm and wheezing and other illnesses. The use of Chinese herbs should also be under the guidance of a Chinese medicine practitioner’s diagnosis, and those with the above conditions should not blindly take aster on their own.