The scientific name of cold potato is Doudou (English name: Pachyrhizus erosus), which is a herbaceous vine of the genus Doudou in Leguminosae. Thick, twining, slightly hairy, sometimes slightly woody at the base. The raceme is 15-30 cm long, with 3-5 flowers per section; Bracteoles setose, caducous; Calyx is 9- 1 1 mm long and densely covered with long bristles; Corolla light purple or reddish, flag nearly round; 8- 10 capsules per pod, nearly square; Root block, spindle-shaped or oblate, generally about 20-30 cm in diameter, fleshy. Take its underground root tuber as raw food or vegetable food. Seeds are highly toxic and should not be eaten, but they can be used as pesticides to control aphids. Originated in tropical America, it is now widely distributed in tropical areas of the old hemisphere and widely cultivated in southwestern provinces of China.