Based on geochemical study of soil, the authors discovered a new type of selenium-rich soil in northern plain of Zhejiang, which occurs discontinuously around the Taihu Lake. The content of selenium in soil is from 0.084×10^-6 to 1.296×10^-6 , with the average value being 0.399×10^-6, the standard deviation being 0.094, and the variation coefficient being 0.037. Studies show that the soil organic matter is closely related to selenium, but not related to soil pH. Under the conditions of rich organic matter and oxidation, content of selenium in such agricultural products as rice, corn, leafy vegetables, and beans is high. Further studies show that the source of selenium-rich soil is related to lake facies. On such a basis, a new type of selenium-rich soil is put forward.