Soil erosion is a key driving factor leading to the degradation of soil quality， and the stability of aggregates in soil is an important indicator for measuring soil quality. Changes in patterns of land use may affect structural substances such as aggregates in soil and the physicochemical properties of soil related. Wulongchi watershed in Danjiangkou Reservoir area was used to study the effects of different patterns of land use including woodland， shrub land， slope farmland and terrace on the physicochemical properties of soil and the stability of aggregates in soil via field investigation， on-site sampling， and indoor analyses. The Le Bissonnais method was used to determine the stability of aggregates in soil. The results showed that there were significant differences in soil organic matter（SOM）， total nitrogen（TN）， clay， silt， and porosity among different patterns of land use（P<0.05）. The content of SOM and TN in slope farmland was higher than that in terrace. Woodlands had the highest content of organic matter and the lowest content of total nitrogen， whereas shrub land showed the opposite trend. The content of clay and silt in soil in slope farmland and terrace was higher than that in soil in woodland and shrub land. There were significant differences in SOM， bulk density（BD） and porosity among soils with different depths（P<0.05）. The porosity in soil in slope farmland and terrace was smaller than that in shrub land. SOM and Porosity decreased and BD increased with the increase in the depth of soil. The mean weight diameter（MWD） of aggregates in soil and structure stability index （SSI） of soil were significantly affected by the pattern of land use（P<0.05）. SSI was in the decreasing order of woodland>shrub land>slope farmland>terraced， with SSI values all greater than 7%， indicating a low risk of structural degradation in soil. The MWD_fw， MWD_ws and MWD_sw of all samples was 0.28-2.20，0.83-2.44 and 0.41-2.30 mm， respectively. The stability of aggregates in soil in woodland was the highest， while the stability of aggregates in soil in terrace was the worst. The average weight diameter of aggregates in soil for the four patterns of land use among the three treatments of Le Bissonnais method was in the decreasing order of MWD_ws>MWD_sw>MWD_fw， indicating that the destruction of aggregates in soil in the studied area is mainly caused by dissipation. The results of path analysis showed that SOM had a significantly positive effect on the stability of aggregates in soil， with the highest path coefficient. TN had a significantly negative effect on the stability of aggregates in soil. Patterns of land use indirectly affected the stability of aggregates in soil mainly by affecting the SOM， TN， clay， poesity， and silt. It will provide reference for protecting the ecology and environment in the Danjiangkou Reservoir area and guaranteeing the safety of water quality in the water source area of South-to-North Water Diversion Project.