Tillage affects the processes of infiltration, runoff and soil erosion. A new method and apparatus measured soil infiltration on hill slope under simulated rainfall conditions were used to measure soil infiltration in slope and fallow land at hilly region of southern Ningxia, and to analyze the effect of tillage on soil infiltration. The experimental site was located on a slope of 20°with water content of 11.3% in soil surface layer. Three rainfall intensities were 20，40，56 mm h-1. The results indicated that the new method and apparatus measured soil infiltration could be well measured the processes of soil infiltration on slope, with many good qualities such as water-saving, laborsaving, easy operation, and high measuring definition. Compared with fallow land, the initial infiltration rate on tillage slope was higher. However, with high rainfall intensities, the result was reverse. With the increasing of rainfall intensity, the soil infiltration on tillage slope reduced sharply, while fallow land remained unchangeable. Contrast to fallow land, the initial time of producing runoff on tillage slope was shorter, but the steady infiltration rate on slope tillage is lower.