Abstract: The average nitrogen utilization ratio is among 28%-37% in rice in our country. The amount of nitrogen use in one season is 27.6% more than the international generally accepted standard. So, 1.8 million tones nitrogen was wasted in every year, and serve pollution were made. The utilization of some slow-released chemical manures could improve the nitrogen utilization ratio. But, the cost was so high. Our country’s scientists have checked up one QTL, which was relation to nitrogen utilization ratio. It displayed addition and dominant effect. So, breeding new rice varieties of high efficient nitrogen utilization which adept to different cultivation conditions was practical and effective. It has an important meaning to reducing the amount of nitrogen use and protecting the environment.