Abstract: In order to promote the high yield and high quality production of maize in Heilongjiang Province,the effects of bioactive selenium nutrient solution（Aokefu）on maize yield,yield components and selenium content were investigated with Heyu 29 as experimental material in field conventional planting mode.The results showed that the effect of foliar spraying at tasseling stage was the best,7.29% higher than that of the control,and the difference reached a significant level;the selenium content of maize at big trumpet stage was 0.17 mg·kg-1,183.33% higher than that of the control,which reached the national selenium rich maize standard (≥0.10 mg·kg^-1),and the difference reached a very significant level.