Chinese yam, also known as Dioscorea opposita, Dioscorea opposita, Dioscorea opposita, Dioscorea opposita, Dioscorea opposita, and Dioscorea opposita, has the functions of nourishing and strengthening, promoting digestion, astringing deficient sweating and stopping diarrhea. Chinese yam contains water, carbohydrates, protein, fat, dioscin, B vitamins, vitamin C and vitamin E, and the carbohydrates are mainly starch. The sticky substance in yam is mucin which is composed of mannan and globulin.