[Objective] Studying the influences of different roads on spatial variance of top soils particle size distribution of Hulunbeier grassland to provide basis for soil erosion control. [Methods] Roadside top soil(1-10 cm) samples were collected at the top and bottom of road bank, the wheel rolling pit, the 0-30 m belts, and the 30-210 m belts from provincial road S203 and unsurfaced road. The soil samples were air dried and then the particle size distribution was measured by pipette method. All data were analyzed by GIS based techniques including Kriging interpolation and semivariance analysis. [Results] There was a significant spatial variance for silt and gravel in the provincial road S203; the coefficients of variation were 95.96% and 80.05%, respectively. Near the road bank, the soils' contents of silt and clay were smaller than other sampling sites, but gravel contents were lager than others. The larger of distance between sampling sites and road, the greater of contents of silt and clay. The soil contents of clay and silt near the wheel rolling pits were lager than other sampling sites for the unsurfaced road. The influences of roads on the contents of silt and gravel in roadside top soil were between strongly to moderately. [Conclusion] Affected by human activities, the particle size distribution patterns of top soils in studying area were reformed, and the contents of clay showed a zonal distribution patterns along the roadsides.