In order to explore the appropriate amount of irrigation water and top-dressing nitrogen for spring corn in the saline-alkali land of the Xiliao River Irrigation Area，a two-factor randomized block design experiment was adopted，and three irrigation amounts(W1，1800 m3·hm-2；W2，1440 m3·hm-2；W3，1080 m3·hm-2)，3 topdressing nitrogen rates(N1，390 kg·hm-2；N2，273 kg·hm-2；N3，156 kg·hm-2) and a control treatment without irrigation and topdressing nitrogen fertilizer were set up.The impact of different water and nitrogen gradients on the water and nitrogen use efficiency of spring corn was analyzed，a regression model between spring corn yield and irrigation amount and top-dressing nitrogen amount was established，and the impact of different irrigation amounts and top-dressing nitrogen amount on spring corn yield was studied.Frequency analysis method was used to obtain the appropriate water and nitrogen dosage for spring corn in saline-alkali soil in Xiliao River Irrigation Area.The results showed that in the saline-alkali land of the Xiliao River Irrigation Area，both irrigation and top-dressing nitrogen fertilizer had a yield-increasing effect on spring corn.The interaction between water and nitrogen was a positive effect，and the effect of water was greater than the effect of nitrogen application.Irrigation water utilization efficiency of spring corn under W3 conditions and the nitrogen fertilizer partial productivity under N3 conditions was higher than other treatments.The maximum yield of spring corn in the saline-alkali land in the Xiliao River Irrigation District was 9912 kg·hm-2，the corresponding irrigation amount code was 0.80(actual dosage was 1440 m3·hm-2)，and the topdressing nitrogen amount code was 0.70(actual dosage was 273 kg·hm-2).Through model optimization，the optimal water and nitrogen ratio scheme for planting spring corn in saline-alkali land in the Xiliao River Irrigation Area was that the irrigation amount during the entire growth period was 1271.7-1673.82 m3·hm-2，and the total topdressing nitrogen amount was 224.95-342.34 kg·hm-2.The water and nitrogen consumption of the optimized plan saved 7%-29.4% of water，compared with the local irrigation amount(1800 m3·hm-2)，and the topdressing nitrogen amount(390 kg·hm-2) saved 12.2%-42.3% of fertilizer.The optimization scope included the water and nitrogen dosage for the highest yield of spring corn in the experiment.The yield was basically consistent with the local yield and met the local requirements for irrigation and top-dressing nitrogen fertilizer.