Yam has the effects of nourishing and strengthening, helping digestion, astringing deficient sweating and stopping diarrhea, and is mainly used to treat chronic enteritis such as diarrhea due to spleen deficiency, cough due to lung deficiency, diabetes, short and red urine, nocturnal emission, female leukorrhagia and dyspepsia. Yam is most suitable to be taken with Ganoderma lucidum, which has the function of preventing and treating diabetes. Yam has a great development prospect in food industry and processing industry.