For exploring the effects of contour hedgerows on the migration of atrazine residues in soil, the features of migration and distribution of atrazine residue those were influenced by hedgerow system under different slope gradients (15% and 20%) were studied by simulated rainfall experiment. The results showed that the vertical migration of soil atrazine remained dominant after rainfall. Grass hedges significantly reduced atrazine residues compared with the control. The residual levels of atrazine did not differ among 3 soil depths inside the grass hedges, whereas atrazine residues were markedly higher in topsoil than those in subsurface soil, and decreased with increasing soil depth in areas without hedges. Atrazine residues in the surface layer (0—10 cm) were significantly higher than those in other layers. Soil atrazine residues at different areas in the hedgerow system were significant different, and the ranks showed as: Hedgerow zone < deposition zone < crop zone. The optimal scaling regression analysis showed that the degree of influence of various factors on the atrazine residues in the soil was in descending order: Grass hedge > soil depth > soil water content > slope area > slope gradient > slope position, and the role of grass hedge was more important than that of the other factors. In general, the hedgerow can significantly affect the horizontal and vertical migration of the soil atrazine in sloping farmland, which is the primary factor to control the loss of agricultural pesticides.