Polygonatum sibiricum: Also known as Ren Xian vine, Radix Scrophulariae and Golden Essence, it is a widely used tonic. Modern pharmacological research shows that Polygonatum saponin and trace elements contained in Polygonatum have the functions of enhancing immunity and delaying aging. It is often used to nourish people with low blood pressure, low resistance and easy fatigue. Modern pharmacological research has proved that Dioscorea opposita. It has the effects of nourishing, inducing interference factors, enhancing immunity, regulating endocrine, invigorating qi, dredging collaterals, relieving cough, resolving phlegm and relieving asthma, and can improve coronary artery and microcirculation blood flow, and can be used for treating chronic tracheitis, coronary heart disease and angina pectoris. Iron stick yam has the function of invigorating qi and moistening lung. It can be sliced and fried into tea or cooked into porridge, which has a good therapeutic effect on patients with deficiency cough and consumptive fever. The dull weather in spring is easy to hurt the lungs and body fluids, leading to diseases such as dryness of mouth and throat due to yin deficiency, burning lips and dry cough. At this time, it is most appropriate to supplement yam, because yam is a safe and peaceful product, which is better than nourishing yin and nourishing lung.