The results of regional geochemical survey show that selenium content of topsoil is 0.34 mg/kg, which indicates that the soil in the study area is selenium-sufficient or selenium-rich. The results also show that the content of heavy metals in soil is at a safe level. Geochemical anomaly inspection reveals that the Se- rich bedrock controls the distribution of Se- rich soils. There are many kinds of selenium-rich and high-quality agricultural products in the study area, such as selenium-rich rice and soybean, with the proportion of the selenium-enriched soybean reaching 100%. There is a significant positive correlation between plant available selenium and total selenium, and a remarkable correlation between plant available selenium and soil CEC, N and P; the clay minerals and organic matters in soils have a strong adsorption and solidification function for selenium. The available selenium mainly exists in the form of selenite. The biological enrichment coefficients of selenium show a significant negative correlation with soil total selenium and nitrogen but a positive correlation with K2O.