Abstract: To find out the effect of nitrogen fertilizer on the yield and quality of different sensitive wheat and its related components，two types of wheat varieties，nitrogen-sensitive and nitrogen-insensitive，were used as materials，and a random block design was used to set two pure nitrogen application of 180 kg/hm2 （N1）and 240 kg/hm2 （N2），the variation of wheat yield，quality and related components of different types of wheat under different nitrogen levels were studied. The results showed that nitrogen fertilizer mainly affected wheat yield by affecting the number of ears and thousand kernel weight. Compared with low nitrogen levels，the yield of nitrogen-sensitive wheat decreased by 19. 82% under high nitrogen levels and the yield of nitrogen-insensitive wheat decreased by 2. 62%. High nitrogen was not conducive to the improvement of nitrogen-sensitive wheat yield and had relatively little effect on nitrogen-insensitive wheat yield. Under different nitrogen levels，the test weight， hardness，and flour extraction rate had no significant difference，and the crude protein content，wet gluten content，and sedimentation value had significant differences. Compared with the low nitrogen level，the high nitrogen level was conducive to the increase of the crude protein content，wet gluten content，and sedimentation value of wheat grains，the increased range of nitrogen-sensitive varieties was 8. 04%，7. 55%，and 15. 84%，the increase rate of nitrogen-insensitive varieties was 3. 38%，3. 23%，and 3. 39%，respectively，and the increase in nitrogen-sensitive varieties was significantly higher than that of nitrogeninsensitive varieties. This study also showed that the RVA viscosity parameters of wheat starch under different nitrogen levels had significant differences. With the increase of nitrogen application，the peak viscosity，trough viscosity，final viscosity，and dilution value of wheat starch all decreased significantly. It can be seen that in terms of wheat yield and quality，the response of nitrogen-sensitive varieties to nitrogen fertilizer is greater than that of nitrogeninsensitive varieties. The effect of nitrogen fertilizer on wheat quality is mainly on the quality of secondary processing，and the quality of wheat primary processing is small.

Key words: wheat, nitrogen fertilizer, yield, quality, starch RVA viscosity parameters