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.