The effect of nitrogen(N)managements of conventional,optimized and different mixture ratios of slow released urea(SRU)to urea(U)on growth,yield,N use efficiency and soil NO-3N content of wheat was investigated via field experiments in Huaibei region.The highest yield and N use efficiency of wheat was under the treatment of SRU2(ratio of SRU to urea was 2∶1).Compared to the treatment of conventional N managements with the N 250 kg/hm2 application rate,yield showed no obvious differences,but N recovery efficiency and N agronomy use efficiency were significantly higher under the treatments of SRU(SRU1,SRU2,SRU3)at the N application rate of 180 kg/hm2，which increased by 43.71%～91.98% and 25.58%～43.71% respectively.Compared to the treatments of all urea used as base fertilizer(SRU4),the treatments of SRU significantly increased the accumulation of dry matter,N content,N recovery efficiency.In the flowering period,soil NO-3N content in 30～60 cm soil layer was high under the treatment of N managements of conventional and optimized.While the accumulation of soil NO-3N under the treatments of SRU showed no significant change during the growth period of wheat.