Abstract: Studied that Effect of Nitrogen application amount on grain yield and quality in wheat under the condition of irragatable land.The results showed that increasing Nitrogen application amount could improve the level of yield components, thus the yield increased; Nitrogenn application overamount increased the spikes per hectare ,but the grain number and one thousand grain weight decreased which lead to the low yield.Increasing Nitrogen application amount could improve nutritional quality and processing quality, but the range changed more and more little with Nitrogen application amount increasing.By comparing the Effect of Nitrogen application amount on grain yield and quality in wheat, we concluded that approporiate Nitrogen application amount is 240 kg per hectare in high ferlity farmland.