Abstract:This study compared the effect of nitrogen levels on qualities of wheat / corn monocropped and intercropped. The results obtained were as follows: 1. There were significant quality advantages of intercropped wheat compared with monocropped wheat. Under the same nitrogen level condition, protein content, sedimentation value, dry gluten and wet gluten of intercropped wheat were increased by 5.1%, 10.8%, 3.7% and 5 3%,respectively , than that monocropped wheat. Moreover, the protein content, sedimentation value, dry gluten and wet gluten in the border rows of intercropped wheat were higher than those of inner rows, respectively. 2. The effects of nitrogen levels on protein content, sedimentation value, dry gluten and wet gluten of both intercropped and monocropped wheat were evident according to statistic analysis. 3. There were significant quality disadvantages of intercropped corn compared with the monocropped. Under the same nitrogen application condition, protein content, oil and one hundred grain weight of intercropped were decreased by 15.3%、1.8% and 11.1% ,compared with monocropped corn. The effects of nitrogen levels on the contents of protein, oil and one hundred grain weight of intercropped corn were significantly improvement.