Abstract: Transferring and distribution patterns of Se in soil-wheat system were studied using Setracer. Available coefficient of soil Se by wheat (SA) is 0.3—1.9, it varied with soil types. Distribution coefficient of soil Se in solid and liquid phases (Kd) is 141—395. it is shown that Se is adsorbed strongly by soil. The order of Kd is Dark brown forest soil>Black soil>Meadow burozem. Concentration coefficient of soil Se for wheat is 0.09—0.14. It is demonstrated that wheat does not belong to the crops which can concentrated Selenium. Selenium is easily transferred in various organs of wheat , its CF value is more than1. Transferring model of Se in soil-wheat food chain was put forward by au thors, and level of soil available Se was avaluated . The results show that available Se is sufficient in brown burozem, but insufficient in black soil and dark brown forest soil. The amount of Se absorbed by per capita per day is 26.6 g in the disease area , which is far less than the recommended value of 40—240 g in China.

Key words: Soil-wheat system, Tracer experiment, Tranferring model of Se, Food chain