Distribution and soil physical properties of water-stable aggregates in red soils different in land use and soil fertility were studied. Results show that the content of soil water-stable aggregates >0.25 mm is consistently affected by land use, and is the lowest in upland soil and the highest in woodland soil. When they are >5 mm,their content is affected by soil fertility. The higher the fertility,the higher the content,which suggests that with increasing soil fertility,the content of soil organic matter increased,thus facilitating formation of more water-stable soil aggregates. Mean weight diameter(MWD)is positively related to content of water-stable aggregates >0.25 mm,which is,therefore,the major factor affecting stability of soil aggregates. Soil physical properties(bulk density,particle density,porosity)differ sharply from pattern to pattern of land use and so do the rules of their variation. However,soil bulk density and soil porosity are favorable related to content of water-stable aggregates >0.25 mm.