Adenophora adenophora has the effects of nourishing yin, clearing away lung heat, resolving phlegm, relieving cough, benefiting stomach and promoting fluid production, and is mainly used for cough due to lung dryness and deficiency of qi and liquid after fever. Polygonatum odoratum has the effects of nourishing yin, moistening lung, nourishing stomach and promoting fluid production. It is mainly used to treat dry throat, thirst, dry cough and fatigue cough caused by fever, consuming yin and promoting fluid production. Ophiopogon japonicus has the effects of nourishing yin, promoting fluid production, moistening lung and clearing heart, and is mainly used for lung dryness, dry cough, cough due to yin deficiency, body fluid injury and thirst. ; The three drugs can enhance the efficacy of nourishing yin, promoting fluid production and moistening lung, because they are all drugs for nourishing yin, so if the spleen and stomach are good, it is best to take them on an empty stomach, which has little to do with the season. It is forbidden to eat spicy food and veratrum during taking!