Pingyao Changyam is also called yam and Dioscorea opposita. Chinese yam belongs to the Dioscoreaceae family and is a plant of the genus Dioscorea. It has good curative effect on many diseases and can be used as food and medicine. Pingyao yam is famous for its long history and excellent quality. It is a national geographical indication certified trademark product. In 2008, 12,000 Chinese yam were planted in Pingyao. mu.

Pingyao, Shanxi Province is the origin of Chinese yam, which has cylindrical fleshy tubers underground. Its tubers are edible and also used as medicine. They have a sweet nature and sweet taste. They can strengthen the spleen and stomach, nourish the lungs and kidneys. They are mainly used to treat spleen deficiency, diarrhea, thirst, spermatorrhea, and leucorrhea. Contains 16 kinds of amino acids and various minerals needed by humans.

The Ministry of Agriculture announced the first batch of 45 geographical indication products of agricultural products in 2011, including Pingyao Changyam geographical indication certified products.