Abstract: In this study, the optimal nitrogen （N）,phosphate （P） and potassium （K） fertilizers dosage of corn planting under high-density planting condition （double plants in one point） was studied in Hetao irrigation district by using ＂3414＂ fertilizer experiment method. The results showed that the combination of N ,P, K fertilizers obviously influence the yields of corn under high-density maize planting condition （double plants in one point）. The comprehensive effect of N,P and K fertilizers was 78.7% ,which indicated the effects of fertilizers can be exerted mostly under coordination condition of enough N,P,K fertilizers. The N fertilizer was the highest effect （52.4%） and P fertilizer was higher （36.4%） among the three fertilizers of N,P,K. Based on the preliminary result, the optimum economy fertilizers dosage of corn planting under high- density planting condition （double plants in one point） in Hetao irrigation district was：N was 393.75 kg/hm2, P205 was 291.9 kg/hm2,K20 was 93.15 kg/hm2.