Hybrid rice (Oryza sativa L.) cultivars play an important role in rice production due to its high yield potential.Optimum nitrogen (N) rate is necessary to achieve the maximum yield of hybrid.The main objective of this study was to reveal the responses of yield and yield component of hybrid rice Eryou 107 to different N rates in Nanjing and Taoyuan,a special eco-site.Leaf area index(LAI),dry matter accumulation was also compared.Rice yield showed a quadratic response to N rates at both sites with maximum yields approximately 10 t ha-1 at the 195 kg ha-1 N rate in Nanjing and maximum yield above 18 t ha-1 at the 375 kg ha-1 N rate in Taoyuan.Panicle per m2 was positively linear related to N rate at both sites in both years,while spikelets per panicle showed a quadratic relation.Larger sink size was the primary contributor to higher yields in Taoyuan compared with Nanjing,and panicle per m2 was the main cause.