In this paper,the Vmax and Km value of seedling nitrogen uptake were detected in three different types of wheat.At the same time,the activity of NR and GS of the flag leaf were analyzed during grain filling.The relationship was discussed preliminary between the dynamics of nitrogen uptake and assimilation character with nutrition quality in black,purple grain wheat.The result showed the uptake,transport and assimilation of nitrogen in the black,purple grain wheat were stronger than the white grain wheat.One of the reasons was probably their nutritional components such as proteins were enriched.