Abstract: In order to develop selenium rich flax sprouts,flax seeds were used as carriers and soaked with different concentrations of food grade sodium selenite to cultivate selenium rich and nutritious flax sprouts.The possibility of selenium enrichment during flax seed germination was discussed from the perspectives of growth indexes,important nutrients and harmful cyanide contents.The results showed that flax seeds could absorb and enrich trace element selenium during germination,and the effect of enriching selenium in flax seeds increased with the increase of the concentration(2.5-5.0μmol·L^-1 Se⁴⁺)of exogenous food grade selenium seed soaking could not only promote the growth and development of flax sprouts,but also reduce the content of cyanide,and improve the nutritional quality of flax sprouts after germination.However,when the concentration of exogenous selenium is too high,the sprouts are in a bad state from the growth and development to the nutrient content,so the high concentration of selenium solution soaking is unfavorable for the cultivation of sprouts.In addition,according to the normal consumption,the possibility of zinc poisoning caused by eating this selenium rich flax sprout is very small,so it can be considered as an excellent dietary source of selenium for human body.