The contraindication of yam boiling water is dampness in the fullness (dampness is too heavy to cause fullness and discomfort in the spleen and stomach) or solid evil, stagnation is prohibited. The efficacy of yam in water is to nourish the spleen and stomach, promote the production of fluids and lungs, tonifying the kidney and astringent, treating the spleen deficiency, less food, diarrhea for a long time, lung deficiency, asthma and coughing and other diseases. Yam, flat, sweet flavor, to the spleen, lung, kidney meridian. In the clinic, it is mainly used for the treatment of kidney deficiency spermatorrhea, hypogonadism, frequent urination, deficiency heat and thirst. In addition, fried yam can replenish the spleen and strengthen the stomach, and is used for spleen deficiency with little food, diarrhea and loose stools (thin and unformed feces), and excessive leukorrhea. It should be noted that the effect of a single Chinese medicine is weak, and other medicines can be used together under the guidance of TCM practitioners to achieve the best therapeutic effect. If this medicine is to be taken, it should be done under the supervision of a doctor.