In this paper, fourteen winter wheat (Triticum aestivum. L. )cultivar which had been spreaded in different decades were used. The results showed that the trends on nitrogenabsorption and accumulation among winter wheat cultivars spreading in different periods were idenified from flowering to maturity, the amount of nitrogen absorption in earlier cultivars (40S and 50'S)was less than that in recent ones, and so was nitrogen participation ratio in spike during flowering. Then, residental nitrogen in vegetativ...