One field experiment was carried out in the Fengqiu Experimental Station. It consisted of six levels of irrigation water and five levels of nitrogen fertilizer. The results showed that water greatly limited the formation of wheat yield when the irrigation water was below 105mm, while N fertilizer became the major factor limiting wheat yield and evapotranspiration when the application rate was less than 112.5kg/hm². The trend of yield increasing with N application rate changed with irrigation water, and a typical parabola was observed when the irrigation rate was 475mm. Water-use efficiency decreased with increase in irrigation water, however, a positive relationship between N application rate and water-use efficiency could be obtained only when the irrigation water was at the low level.