【Objective】Strong soil erosion affects profoundly soil development on slopes. On slopes the same in parent material, but different in erosion intensity, soil varies sharply in weathering development degree. In the granite hill and mountain areas of Southeast China, the soil developed on weathering residual slopes suffers severe water erosion, and differs distinctly from other zonal soils in soil weathering development profile. 【Method】 This study in oriented to characterize weathering development of soil profiles at different landform positions of an eroded weathering granite slope. A typical weathering granite slope was selected in Shengzhou, Zhejiang province for monitoring of soil erosion with the help of the Shengzhou Soil and Water Conservation Monitoring Station. On the slope where the station sits, three typical soil profiles (140 cm in depth) were selected at sites different in erosion intensity along the slope from top to bottom, and soil samples were collected 20 cm apart from bottom to top in each soil profile. So a total of 21 soil samples were gathered for analysis of basic physicochemical properties and chemical total contents in various soil layers. On such a basis, calculation was done of main chemical weathering coefficients of the soil layers and total weathering intensity of the soil profiles, separately. As the zonal soil of the studied is red soil, of which the main chemical weathering processes are enrichment of iron and aluminum and leaching of dissolved salts. Therefore, the chemical weathering indices selected in this study were dominantly those that may reflect enrichment of iron and aluminum and leaching of dissolved salts, they are ① Al₂O₃/SiO₂, ② Fe₂O₃/SiO₂ ③ R₂O₃/SiO₂, ④ Al₂O₃/(RO+R₂O) and ⑤ R₂O₃/(RO+R₂O). In order to analyze weathering intensity of each soil layer relative to the bottom layer in the same soil profile and facilitate comparison between the soil layers in weathering intensity, further calculation was performed of relative weathering intensity (I relative) of each soil layer relative to the bottom one. 【Result】The following conclusions were drawn from the analysis and calculation:（1）The soil of the profile at the site of severely eroded weathering residual granite slope is on the whole rather slow in soil developing and maturing process, and differs sharply from the typical zonal soil in further development, and severe erosion greatly hinders maturing processes of the soil; and the severer the erosion, the poorer the soil developed;（2）The soil profile as a whole is not very high in weathering intensity; the variation in weathering intensity between soil layers in the soil profile is very gentle; the peak of weathering intensity appears in the 40~60cm soil layer, instead of the surface soil layer; the processes of desilication and aluminum enrichment weaken with profile depth and intensifying weathering degree; and the decreasing trends of Al₂O₃/SiO₂ ,Fe₂O₃/SiO₂ and R₂O₃/SiO₂ are quite obvious in all the three soil profiles, which demonstrate that soil weathering degree lowers with profile depth;（3）Chemical stratification of the soil profiles is not distinct, with all the weathering indices forming a boundary layer at about 60cm in depth; the layers above it are obviously affected by water erosion and those below mainly inherit the properties of the residual soil parent material;（4）In terms of weathering intensity, the three soil profiles display an order of bottom profile < mid profile < top profile, which is just the reverse of that in terms of erosion intensity; (5）Weathering degree is significantly and positively related to the contents of organic matter and clay, and also to physical properties of the soil under erosion; However, the influence of organic matter content is greater than that of clay content in the soil in deposition environment. 【Conclusion】Affected by erosion, the illuvial horizon of soil profile does not develop on slopes, the false illuvial horizon is a certain weathering degree weathering residual layer, but is not formed by eluviations, which leads to the division of soil layer developed from hill and mountain areas differs from conventional method.