<p>The silty clay slope is prone to cracking under the rainfall-evaporation cycle. Rainfall runoff on the slope surface entrains fine particles, which fill the fractures and migrate to deeper layers along the fracture sidewalls. This process causes an increase in local pore water pressure and a reduction in slope shear strength, posing a risk of slope instability. Taking the silty clay slope along Gangyao Road in Yichang as the research object, permeability tests, rainfall simulation tests, and numerical analyses were conducted on fractured silty clay to explore the effects of fractures on the slope seepage field and fine particle migration characteristics. The results show that during rainfall, the median particle size of the effluent shows an overall upward trend; the number of silt and clay particles adsorbed on the surface of quartz sand in the lower part of the fracture is the largest. This phenomenon leads to the formation of a “lower convex” phreatic line at the fracture due to preferential seepage, which gradually extends inward into the slope. Fracture width has little effect on fine particle migration-increasing the width does not significantly improve the migration distance but slightly increases the number of fine particles migrating transversely across the fracture. In contrast, fracture depth significantly affects fine particle migration: as fracture depth increases, the vertical migration distance of fine particles increases accordingly.​.</p>