The nature of scale-dependent heterogeneity of soil water movement is still poorly understood. To address the issue, the objectives of this study are to 1) investigate heterogeneity of soil water movement in different measurement scales using dye infiltration experiments; 2) characterize flow heterogeneity information included in different scales using a random cascade model, and 3) evaluate scale-dependent heterogeneity of water flow in soils. The field experiments of dye infiltration included three measurement scales (three dye source surface areas of 25x25, 50x50, and 100x100 cm) and three hydraulic boundary conditions (three initial water ponding depths: 1.5, 2.5, and 5.0 cm at the surface). The random cascade model with a lognormal distribution was used to simulate the infiltration process in soils and different methods were applied to estimate the model parameters. Results based on the experimental data and model simulations showed that the hydraulic boundary condition was an important factor affecting the flow patterns in soils. To accurately describe flow transport processes at different measurement scales, it is necessary to consider the heterogeneities in the vertical and horizontal directions. As the scale increased, the effect of multi-dimensional heterogeneities on the flow processes in soils became more significant. Interdependency between flow paths also increased with the scale.