Ai Ye, also known as Artemisia absinthium, is the leaf of the plant Ai of the Asteraceae family, and the process of medication is the whole herb into the medicine. This medicine was first recorded in the North and South Dynasties Tao Hongjing’s “Materia Medica Classic Collected Notes”, the nature of the warm, bitter flavor, into the spleen, kidney two meridians, for the pure yang product, can comply with the birth of yang qi, to drive away the body of the long-living cold and dampness, is a health care product. In the summer when dampness is heavy, dampness stagnation in the middle jiao yang qi, prone to loss of appetite, lethargy and drowsiness, with moxa leaf foot soak can be effective in expelling summer dampness. Ai leaves have aroma and turbidity, dispersal of cold pain, expel poison in addition to the role of the plague, the folk have three years of Ai Langzhong not to be used in the proverb. Ai leaves can be used externally in the clinic, such as decoction of water, moxibustion, can play a better therapeutic effect.