Abstract: Elite maize hybrid Guidan0810 was selected as material, the effect of fertilizing level and planting densities on yield and nitrogen utilization were discussed in the study. In one year two seasons’field experiments, 4 main plots (fertilization levels) and 6 subplots (planting densities) were set in a split plot design. The results suggested that yield had close relationship with fertilization levels and planting densities. Different fertilization levels and planting densities significantly affected yield. With the increase of nitrogen fertilization, nitrogen use efficiency, nitrogen agronomic efficiency and nitrogen physiological efficiency were declined. Under the same fertilization level, nitrogen use efficiency, nitrogen agronomic efficiency and nitrogen physiological efficiency were a little increase with the increase of planting density, so nitrogen efficiency could be improved by regulating planting density. The results also showed that A2 (including N 225.0 kg/hm², P2O5 75.0 kg/hm², K2O 187.5 kg/hm²) matching to B3 (52500 plants/hm²) or B4 (60000 plants/hm²) was a better design, which could obtain higher yield: 8207.8 kg/hm² and 7913.2 kg/hm², respectively.