Based on the sampling data of soils, rocks and agricultural products in the Jiucheng-Jiemao area, Yingjiang County, Yunnan Province, geochemical characteristics of selenium in soils and main influencing factors were studied, and the characteristics of selenium content in agricultural products were analyzed. The results show that the range of selenium content in soils of the study area is 0.01×10 -6~2.22×10 -6, the average value is 0.23×10 -6 and the area of selenium-rich soil is 73.41 km 2, accounting for 17.47%, that selenium is mainly in the form of residue state, but the percentage of water soluble state and ion exchange state which can be effectively absorbed by crops is only 3.32%, and that the content of selenium in soil is mainly influenced by soil-forming parent materials, silica-sesquioxide ratio, organic matter and pH value. According to the relevant evaluation criteria, a total of fifteen coffee beans, one Australian nut, two rice and five sugarcanes can meet the requirements of safe selenium-rich food. The safe selenium-rich rate of four kinds of agricultural products is 100%, 10%, 1.32% and 16.67% respectively, which is basically consistent with the distribution position of selenium-rich soil.
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