Abstract: 【Objective】 Study the coupling effect of water and nitrogen and its effects on the canopy structure and photosynthetic rate of spring wheat on the basis of the slope drip irrigation wheat planting model, so as to provide a water and nitrogen management strategy and theoretical basis for the cost-saving and efficient production of slope planting mode. 【Methods】 Xinchun 44 was used as the test material, and two modes were set up: TR6H and TR8H (a drip irrigation belt was located at the top of the slope, which was supplied 6 rows and 8 rows of wheat moisture, respectively, and the slope was 15 degrees). W₃, W₂, W₁ (4,500, 4,050, 3,600 m³/hm²) irrigation rates and N₃, N₂, N₁, N₀ (300, 270, 240, 0 kg/(N·hm²)) nitrogen application levels were set, and W₃N₃ was the control (conventional water and nitrogen treatment). 【Results】 The plant height, stem tiller number, leaf area index, canopy light interception emissivity and photosynthetic rate of TR6H were higher than those of TR8H at the flowering stage. The general trend of plant height and canopy light radiation interception was (W₃ and W₂) >W₁, (N₃ and N₂) > the trend of N₁ > N₀, while the leaf angle showed the opposite trend, namely the leaf angle of the low-water and low-nitrogen treatment was larger. The overall trend of leaf area index and net photosynthetic rate was W₃> W₂> W₁, N₂> N₃> N₁> N₀. Compared with the conventional water and nitrogen treatment (W₃N₃), the two modes of TR6H and TR8H significantly increased the canopy light interception emissivity and photosynthetic rate, with an increase of 3.6%-4.9% and 3.9%-10.2%, respectively. 【Conclusion】 The reasonable coupling of water and nitrogen under the slope mode can optimize the canopy structure and obtain a higher photosynthetically active radiation interception rate by maintaining a high stem tiller number and leaf area index, while keeping a certain amount of light leakage loss with a high plant height and compact plant type. TR6H is recommended for comprehensive consideration mode, and W₃N₂ is recommended for water and nitrogen treatment.