Results of experiment showed that, for the hybrid rcie with a high yield of more than 1000 jin per mu, the N requirement of early hybrid rice was more than that of general cultivar, while that of late hybrid rice was less than that of general cultivar. The amount of N absorbed by hybrid rice in the middle growing stage was over half of the total amount absorbed in its whole growing period;however, the N supply by soil was less in the middle growing stage of rice. To meet the N requirement of hybrid rice, a method of applying larger part of N fertilizer in middle growing stage nn the basis of maintaining steady supply of N in early growing stage was adopted, which gave a yield increase of early rice ranging from 2.97-8.99% and that of late rice rangins from 7.54-14.06%. It also found that due to the adoption of this method, the number of ears per mu and that of grains per ear were increased, all these indicate that the application method is suitable for hybrid rice characterized by vigorous growth of root system and tillers in early growing stage, and growing predomince of ears and grains in middle growing stage, and it may also prevent the rice from premature senility. Therefore, it is favorable for promotion the yield potential of the hybrid rice.