The potato has been cultivated and domesticated in South America for tens of thousands of years,but its spread between continents has only occurred in recent centuries as navigation is the only possible way.However,when and how the potato was introduced to China is still uncertain.According to the historical data of navigation and the earliest discovery of unique species between continents,it is possible that the introduction of potato to China may be in the 21st year of Yong Le of Ming Dynasty (1423) when ZHENG He returned from his sixth voyage.Results of analyzing the local chronicles showed that the potato was first planted mainly in the Peking in the first 200 years,and gradually became a royal delicacy.During the Qing Dynasty,it was widely spread in Wumeng,Wuling and Qinba mountainous regions adjacent to each other,where was the earliest concentrated potato producing area in China.