Yam, eaten by human beings since ancient times, is one of the earliest plants eaten by human beings. As early as the Tang Dynasty poet Du Fu's poem, there was a famous sentence "Fill the intestines and eat more yam". Yam tuber is thick and juicy, sweet and soft, and sticky. Both raw and hot food are delicious. According to the test results of Chinese yam by Shandong Academy of Agricultural Sciences, its tuber contains crude protein 14.48%, crude fiber 3.48%, starch 43.7%, sugar 1. 14%, potassium 2.62%, phosphorus 0.2% and calcium 0.1. Among the 18 amino acids needed by human beings, yam contains 16 amino acids. Chinese yam is tender and contains rich nutrients and health-care substances. Shennong's Herbal Classic says, "Tonifying the middle energizer can make up deficiency, dispel cold and heat, tonify the middle energizer, strengthen tendons, and it will be effective after long-term service"; (("Rihuazi Materia Medica") said that "it helps the five internal organs, strengthens the bones and muscles, and calms the nerves, which is mainly used to drain the essence and forget"; Compendium of Materia Medica holds that yam can "benefit kidney qi, strengthen spleen and stomach, stop diarrhea, stop paralysis and moisten fur". Recent studies have shown that yam can induce interferon and enhance human immune function. Choline and lecithin contained in it are helpful to improve people's memory. Regular consumption can strengthen the body and delay aging, so it is a favorite health care product. Bionic food, mainly yam and supplemented by konjac, is a rare healthy nutritious food with rich nutrition, nourishing body building and beauty beauty. Yam is not only yam, but also food. Not only can it be made into health food, but also has the medicinal value of regulating diseases. "Compendium of Materia Medica" points out: Chinese yam can cure all kinds of deficiency injuries, five strains and seven injuries, except head and face wind, low back pain, vexation and heat, deficiency of heart-qi, happy memory, kidney-qi, spleen and stomach, diarrhea and moistening the fur, and ointment swelling and hard poison can be treated; Yu Ye Soup and Zipei Soup are recorded in medical enthusiasm and the West. Yam and Astragalus can treat thirst, fatigue and asthma. It is often combined with Chinese herbal medicines with the same origin of medicine and food, such as Lycium barbarum, Mulberry, etc., and can make tea for drinking, which can tonify the kidney, strengthen the body and enhance the resistance. Drugs can have the following effects: Liuwei Dihuang Pill, Bawei Dihuang Pill and Guishao Dihuang Pill, all of which are famous prescriptions of yam. Modern science has proved that yam can significantly reduce the activity of enzymes that accelerate the aging of the body. Bawei Dihuang Pill containing yam is mainly used to treat postpartum sweating. Baoyuan Qingjiang Decoction and Baoyuan Hanjiang Decoction can treat hematemesis and nosebleeds. Cold drenching soup and ointment drenching soup can cure drenching insects. Yam can also treat tuberculosis, typhoid fever and gynecological diseases, which is conducive to prolonging life. Anti-tumor effect yam tuber is rich in polysaccharide, which can stimulate and regulate human immune system. Therefore, health care drugs that enhance immunity are often used. Dioscorea opposita polysaccharide can antagonize the cellular immune suppression caused by cyclophosphamide and restore some or all of the suppressed cellular immune functions to normal. Yam can also enhance the phagocytosis of white blood cells. For example, Liuwei Dihuang Pill can treat chronic nephritis, hypertension, diabetes, neurasthenia and other diseases. Baizhi Dihuang Pill can treat ankylosing spondylitis, gynecological fetal leakage, vulvar itching, amenorrhea and other symptoms of yin deficiency and excessive fire. Guishao Dihuang Pill can treat otodynia due to yin deficiency, tinnitus and spontaneous sweating.