The function of Dihuang ointment mainly lies in its components, such as Polygonatum sibiricum, Eucommia ulmoides male flowers, etc., which have the effects of nourishing blood, nourishing yin and replenishing marrow. Ginseng, Poria cocos and Lycium barbarum contained in it can tonify kidney and fix sperm, among which okra can fix sperm, stop nocturnal emission and lock yang, which has a unique effect on nourishing kidney yang. Yam and Euryale ferox can strengthen the spleen, replenish qi, and promote diuresis and dampness. The donkey-hide gelatin and honey contained in it can clear away deficiency and heat.