Selenium on the ridge is rich in precious selenium because of long sunshine time and large temperature difference between day and night. The selenium-enriched sweet potato planted in the village has bright skin, red color and beautiful shape, and is known as' selenium potato on the ridge', the taro table in potatoes. Selenium potato can be steamed, roasted and boiled in porridge, which is soft, waxy and sweet and melts in the mouth. So it is loved by so many people.