Se - enriched soybean was prepared by foliar fertilization . the thesis focuses on the analysis of the distribution of selenium in soybean under different concentration of sodium selenite , which contains the contents of the total selenium, inorganic selenium, organic selenium and selenocystine. The results of expe riments show that the total Se contents in soybean increased as the application of sodium selenite concentration increased. In soybean grain, selenium mainly exist ed in the form o f organic selenium, covering 84% - 91% of the total selenium contents, while in organic selenium mak es up a smaller proportion, from 8.9% to 16%. The selenium from SeCys 2 was approximately 7 - 10% of the total Se present in the selenized soybean.