Abstract: In order to adapt to the change of growth characteristics of ratoon tiller with the main rice harvested by machine in low cutting, the nitrogen application rates and dates were set. And the nitrogen application technique in ratoon season was studied by observing and analyzing tillers, yield and its component. The results showed that, the economic nitrogen fertilizer application amounts was 180 kg/hm2 in ratoon season. The method of early promoting fertilization and fractionated application panicle fertilizer and grain fertilizer in middle may effectively promote the germination of effective tillering and its development of ear and grain, significantly increased yield.