Yam decoction in water has the effect of strengthening the spleen, benefiting the lungs and tonifying the kidneys, but the effectiveness of yam alone is limited. Yam is the dried rhizome of the plant Dioscoreaceae. It is sweet in flavor and flat in nature. It belongs to the spleen, lung and kidney meridians. It can replenish the spleen and nourish the stomach, promote the production of fluids and benefit the lungs, and replenish the kidney and astringe the essence. It is used for spleen deficiency with little food, prolonged diarrhea, lung deficiency with asthma and cough, kidney deficiency with spermatorrhea, dyspareunia, frequent urination, deficiency heat and thirst. Chinese yam with lock yang can enhance the effect of tonifying the kidney and assisting yang, astringing essence and stopping spermatorrhea (consolidating semen and preventing spermatorrhea). It is used in treating deficiency of kidney yang and lack of solidity of semen (deficiency of kidney, kidney cannot hide semen), such as spermatorrhea. Yam with Radix Codonopsis can enhance the effects of tonifying the spleen and benefiting Qi, nourishing Yin and generating fluid. It is suitable for weak spleen and stomach, deficiency of stomach yin (insufficient yin fluid in the stomach), poor appetite and dullness (lack of appetite, reduced food intake), fatigue or diarrhea. Chinese yam with soursop can enhance the effect of nourishing the kidney and tonifying the lung, relieving cough and asthma. It is suitable for asthma caused by deficiency of the lungs and kidneys and lack of power of intake. If there is any discomfort, patients are advised to seek medical advice and use the medicine under doctor’s guidance.