The effects of raw earth are to clear heat, cool the blood, nourish yin and promote the production of body fluid. The main medicinal effect is emphasized in clearing heat. Generally heat like look at the tongue, tongue red tip red pulse faster pulse number will use raw earth. Rehmannia mainly emphasizes nourishing the liver and kidney, filling the marrow, mainly emphasizing tonicity, the majority of patients with deficiency of Qi and blood will use rehmannia to nourish the blood and nourish the blood. Raw ground mainly tends to clear heat and cool the blood, and is generally used when there is heat and yin deficiency in the body, while rehmannia is generally used for cases such as deficiency of qi and blood. Therefore, there is an essential difference between raw ground and rehmannia. Reheated ground is made from raw ground after concoction, which has both the same parts and differences. The same part nourishes kidney yin and liver and kidney with similar efficacy, while raw earth focuses on clearing heat and rehmannia focuses on tonicity.