The influence of tillage on bulk density of the surface soil (0~20cm) was stronger than on that of the subsoil. Soil infiltration rate varied greatly with the time and tillage. The infiltration rate under conventional tillage was the highest among the treatments in the summer corn growth season, but the differences between the treatments got smaller along with the time. In terms of infiltration rate under different water tension conventional tillage was the highest and non-tillage the second, direct drilling the lowest, and the trend was the same with different growth seasons of the summer corn. The number of macropores under conventional tillage was 65% more than that of non-tillage and direct drilling, reaching the 5% significance level, but the difference between non- tillage and direct drilling not significant. As time went on, the number of macropores reduced and the number of mid-, micropores increased. But the number of macropores under conventional tillage still was the highest, at 5% significance level over that under non-tillage and direct drilling.