Abstract: In this paper,randomized block experiment are adopted. The effects of several different typos of foliar fertilizers on the economic characters and seed yield of oil flax in dry land were compared by field experiments. The results show that the Brassinolido-gibborollin has certain promoting effect on oil flax vegetative growth. Plant height increased 6.03% ; potassium dihydrogon phosphate ＋ urea can significantly improve the oil flax seeds per fruit, increased 7.93%; Guoguang dilute biotin, bios and KH2PO4 ＋ urea treatment can significantly improve 1000-seed weight of oil flax, increased 5.49%,4.14%,3.95%. Guoguang dilute biotin and KH2PO4 ＋ urea treatment on seed yield reached 1 446.22 kg/hm^2 and 1 433.87 kg/hm^2 respectively, increased by 19.02% and 18.00%. The increased production was significant. It was proved that spraying foliar fertilizers containing amino acids or large elements on oil flax seed can effectively promote the grain formation and filling process of flax, and increase 1000-seed weight and seed yield of oil flax. It has a significant effect on the reduction （duo to the removal of fortilizors） of yield in the late stage of birth.