Abstract: In order to optimize the cultivation model of efficient for rice planting in saline-alkali paddy field，to improve yield and promote economic efficiency. To‘Ji jing 511’as the experimental material, it was carried out with split-plotex periment design, the effects of irrigation methods and nitrogen application on their yield and its constituent factors were studied. The results showed that: (1)As the nitrogen application increased, the plant height gradually increased. Plant height was significant positive correlation with seed yield, r=0.794*. (2) Nitrogen application had greater effect on yield, effective panicles and 1000-grain weight, had less effect on grains per panicle and grain number per panicle. Irrigation rate had greater effect on effective panicles and 1000-grain weight, had less effect on yield,grains per panicle and grain number per panicle.(3)Yield were positively correlated with effective panicles, r=0.647*. They were correlated with grains per panicle and grain number per panicle, but not positively. The regression equation was Y=922.475 350.159X1.（4）The highest yield of seed was obtained when nitrogen application was N2 and irrigation methods rate was traditional irrigation, they were 3.3% higher than intermittent irrigation, 6.7%higher than irrigation of control. The results showed that the effective panicles, grain number per panicle and seed setting rate were significantly affected by the change of nitrogen fertilizer, which was the key factor affecting yield.