Abstract: Two different conserved plots and a natural soil plot at Xiangjiaba Hydropower Station disturbed area in Sichuan Province are taken as example to study the physicochemical properties and microbial biomass of slope under different conservation mode and reveal the influence of different conservation modes on soil quality. The result show that the microbial biomass and organic carbon content of natural forest slope was higher than that of conservation slope; the pH of vegetation concrete substrates is the largest, followed by foreign-soil spraying and natural forest. The correlation analysis showed that the organic carbon related with microbial biomass, suggesting that the microbial biomass and soil organic matter of slope soil in the disturbed area are closely related; the soil C/N and organic carbon was positively correlated, indicating that the changes of slopes C/N under various conservation modes is primarily determined by the organic carbon.