Abstract: Hydrus1D model was used to simulate water flow and nitrogen transport and transform under winter wheat crop. The results showed that crop evapotranspiration in different plots with distinguished irrigation and fertilization were about 400mm, which accounted for above 95% of total water consumption in root zone. While water leakage was little with the maximum quantity of 38.4 mm. Root N uptake was the majority of total nitrogen consumption with the proportion of above 94%. While nitrogen leached was much less with the maximum quantity of 8.7 kg/hm2. The amount of nitrogen leaching mainly relied on the quantity of water leakage. Water leakage and nitrogen leaching could be lessened principally by adjusting irrigation measurement. Considering higher water use efficiency, nitrogen use efficiency and less water leakage and nitrogen leaching, the optimal irrigation and fertilization treatments were reasonable and advisable.