Although yam bean didn't produce toxic substances like solanine like potatoes after germination, it shows that Chinese yam has started a new life process. Once germinated, yam bean will start to take root. In this process, the nutrients of Dioscorea zingiberensis began to undergo substance transformation under the action of growth hormone, accompanied by the formation of substances toxic to animals, including people. Therefore, yam bean should be avoided as much as possible after germination.