The research related to effects of water stress on nitrogen fertilizer use efficiencies of different nitro-gen use efficiency genotypes of rapeseed is few. Four different NUE rapeseed cultivars with high N use efficiency (Monty and Xiangyou 15)as well as low N use efficiency(R210 and Bin270),were used with three nitrogen ap-plications(0. 05,0. 2,0. 4 g/kg). Pot experiment was conducted in greenhouse to determine the effects of nitrogen application and water stress at flowering stage on yield performance parameters and nitrogen use efficie...