Professor Lu Fang,a master of traditional Chinese medicine,discovers in clinical practice that yin deficiency and in-ternal heat is the most common syndrome of adult onset Still's disease(AOSD).In the later or recovery period of AOSD,as well as long-term use of glucocorticoids,it is easy to lead to the syndrome of yin deficiency and internal heat.At night,yang enters yin and yin does not control yang,resulting in patients often having a fever at night with a low heat intensity.In treatment,Professor Lu be-lieves that nourishing yin and reducing fever,cooling blood and removing steam should be prescribed,so he chooses to Di Gu Pi Tang(Chinese wolfberry root-bark decoction)for treatment,and modified it according to the patient's condition.Professor Lu Fang holds that Di Gu Pi Tang has a significant effect on treating AOSD,and his experience is worth learning and promoting in clinical practice.