Gastrodia elata is sweet and flat. It has the functions of calming liver wind and relieving spasm. Especially, it has a good effect on the symptoms of headache, mouth-eye deviation, apoplexy and phlegm retention. Yuzhu is sweet in taste and slightly cold in nature. It has the effects of nourishing yin and moistening dryness, promoting fluid production and quenching thirst. The combination of the two drugs can calm the liver, calm the wind, nourish yin, moisten noise, promote fluid production and quench thirst.