Abstract: Abstract: In order to obtain the best N fertilizer application rate in super hybrid rice, Zhongzheyou no.1 was took for experimental materials and six different treatments was set up. Comparison of effects of these treatments on Yield and Related characters of Zhongzheyou no. l was carried out .The results showed that without application of N fertilizer or a single application of N fertilizer with no P, K fertilizer, yields was lower. In the situation of P, K fertilizer fixed amount, yields were increasing gradually with the increased use of N fertilizer. When N fertilizer application arrived at amount of 180 kg / hm2, the yield was highest, and which was significantly difference with other treatments. when excessive N fertilizer application, more than a amount of pure N 240 kg / hm2, the yields would decrease.