It is a sweet and flat drug, mainly belongs to the liver and kidney meridians, and is used to treat the deficiency of liver and kidney yin resulting in deficiency, weakness, lumbago and leg weakness, and can also play the role of nourishing yin, clearing the liver and brightening the eyes, that is, after nourishing yin there is a brightening effect. The two drugs together, one is used to nourish the qi of the lungs and kidneys, and the other nourishes the yin of the liver and kidneys, and the two drugs in water are a good pair.