The effect of nitrogen fertilizer dosage on corn yield and nitrogen utilization after six years of soybean-corn rotation to fertilize soil was studied，so as to provide a theoretical basis for the decision of nitrogen fertilizer dosage for corn production in Jiusan branch of Beidahuang agricultural reclamation group Co.，Ltd.The field trial was carried out at Daxijiang farm，Jianshan farm and Qixingpao farm in 2021.Nitrogen reduction and nitrogen increase treatments were designed in the experiment based on the local recommended application rate，and the growth and development，yield and nutrient absorption and utilization of maize were studied.The result showed that nitrogen reduction by about 20% in the three farms did not have a significant impact on maize plant height，dry matter accumulation and yield indicators during the growing season，compared with the local recommended fertilization rate.Nitrogen reduction reduced the dry matter accumulation of maize stems and leaves at the mature stage，but the dry matter accumulation of grains in Jianshan farm increased by 4.29%.The yield of nitrogen reduction treatment in Daxijiang and Jianshan farms increased by 2.48% and 4.29%，respectively，and the economic benefits increased by 802 and 1031 yuan/hm².Nitrogen reduction significantly reduced the nitrogen uptake of corn stems and leaves，and increased the grain nitrogen uptake in Daxijiang and Jianshan farms.Nitrogen reduction treatment significantly improved the agronomic efficiency and partial productivity of nitrogen fertilizers in the Daxijiang and Jianshan farms.The comprehensive analysis showed that after six years of soybean-maize rotation measures under the condition of straw returning，the nitrogen fertilizer application of corn stubble could be reduced by about 20%.