Abstract: The topography of ocean trenches exhibits significant variations and complexities, which greatly influence sound propagation. To analyze the impact of the trench on the vertical correlation of wind-generated ambient noise in deep sea, based on three-dimensional ray theory and actual trench topography, a theoretical model of wind-generated ambient noise in deep sea near the trench is established. Then, the sensitivity of the vertical correlation of the noise field to variations in trench parameters is studied. Finally, the mechanism of how the trench affects the vertical correlation of noise field is analyzed using ray inversion method. Simulation results demonstrate that array depth has a greater impact on vertical correlation than that of the horizontal distance from the center of the trench. Deeper depths result in weaker oscillation and closer proximity to 0 for vertical correlation. Increasing trench depth and width slightly increases then decreases correlation; however, this change is not significant. When array depth is deeper, large-depth terrains like trenches have a greater impact on vertical correlation than slope terrains do. Ray tracing inversion analysis reveals that presence of trenches alters sound ray propagation paths, leading to changes in types and quantities received by arrays - this is primarily why spatial characteristics change due to trenches.