A field experiment was carried out in Hexi area in 2019 to explore the effects of intercropping mode and nitrogen applications on the forage yield，water and nitrogen utilization efficiency of silage maize.The purpose of this study was to define the suitable management measures for silage maize production in Hexi area.Three planting patterns(LM:intercropping of silage maize and dolichos lablab，FM:intercropping of silage maize and fodder soybean，M:single sown of silage maize)and four nitrogen application levels(N1:0 kg·hm-2；N2:120 kg·hm-2；N3:240 kg·hm-2；N4:360 kg·hm-2)were set up.The results showed that compared with N1，the nitrogen application levels of N2，N3 and N4 significantly increased the fresh，hay and total yield of maize and legume crops，in which the total fresh grass yield increased by 29.60%，57.83% and 61.45% and the total hay yield increased by 30.73%，59.14% and 61.27%，respectively.Moreover，the total yield of fresh grass and hay grass of FM treatment was significantly increased by 5.74% and 6.26% than that of M treatment.Compared with N1，the nitrogen application levels of N3 and N4 significantly reduced soil water storage during harvest，but there was no significant difference in water consumption，while it significantly improved the water use efficiency of population(WUEB).The WUEB of FM was significantly higher than that of M treatment.Compared with N1，the nitrogen application levels of N2，N3 and N4 significantly increased the nitrogen content and absorption of maize and legumes.Compared with N4，the nitrogen application levels of N3 significantly increased the nitrogen use efficiency(NUE)of silage maize，legume crops and population.The total nitrogen content and absorption under the FM and LM treatments were significantly higher than that of M treatment，and the NUE of FM was significantly higher than that of LM.The highest WUEB(65.22 kg·hm-2·mm-1)and NUE(1.21 kg·kg-1)were obtained under the FM-N3 treatment.In conclusion，the FM-N3 treatment is the most suitable management practice for the intercropping planting of soybean and forage grass in Hexi area.