A field experiment was carried out on dryland of loess plateau to study the effect of different nitrogen rates on nitrogen absorption and allocation of spring maize in double ridges mulched with plastic film.Six nitrogen rates are 0,100,200,250,300 and 400 kg/hm².The experimental results showed that:(1)The content of nitrogen and the nitrogen accumulation and kernel increased with the improvement of levels on nitrogen application,while the effect is not significant when nitrogen application exceed 250 kg/hm².(2)With the growing stage increasing,the nitrogen content of spring maize decreased while the nitrogen uptake of spring maize increased.(3)The nitrogen translocation amount and the transferred nitrogen contribution ratio of leaf and stem+sheath are higher than that of other organs.(4)With the increase of nitrogen application,the kernel yield increased firstly and then decreased.The kernel yield is the maximum when nitrogen rate is 250 kg/hm² and the kernel yield is 11 932 kg/hm².In addition,the nitrogen harvest index,nitrogen agronomic efficiency of the nitrogen level of 250 kg/hm² are higher than that of the nitrogen level of 300 and 400 kg/hm².From the consideration of spring maize yield,nitrogen utilization point of view,250 kg/hm² is a reasonable nitrogen rate.