【Objective】This paper was oriented to investigate soil physic-chemical properties and erodibility K and their distributions in the southern piedmont of the Himalaya Mountains south,in an attempt to provide certain scientific theories and data base for developing a project of soil and water conservation and ecological construction.【Method】Three different stands of forest typical of the region, i.e., mixed evergreen and deciduous forest(MT-1）, mixed broadleaf-conifer forest(MT-4), and evergreen broad-leaf forest in four forest lands(MT-2 and MT-3) on the southern piedmont of the Himalayan Mountains were selected as sample lots and soil samples were collected in the 0~20 cm soil layers for analysis of soil bulk density, porosity, aggregate status, aggregate destruction rate, soil particles size composition and organic carbon content. Besides, soil erodibility K of the lands was calculated using the EPIC model.【Result】(1) The forest stands in the four forest lands exhibited significant impacts on aggregate status,soil particles size composition, organic matter content, and soil erodibility K (P<0.05) of the soil. In the soils, mechanically stable and water-stable aggregates were dominated mainly with aggregates >0.25 mm in particle size, with the former accounting for more than 75% and the latter for more than 60%. on the whole the soil aggregates were quite stable in destruction rate, varying between 10.16%~24.74%. In terms of soil particle size, the soils in the four forest lands were composed mainly of silt, with clay accounting only for 0.51% ~ 3.02%. Organic matter content in the soils of the four lands varied in the range between 92.53 g·kg^-1 and 133.8 g·kg^-1,and was significantly higher in MT-3 than in the other three (P<0.05), Generally speaking the soils were all quite high in soil fertility; (2) Soil erodibility K in the soils of the four forest lands, though different in soil type varied in the range between 0.1862 and 0.3430 and averaged 0.2635, indicating that they were all moderate on the high side in soil erodibility, but in an order of MT-3 (evergreen broad-leaf forest) ＞ MT-2 (evergreen broad-leaf forest) ＞MT-4 (mixed broadleaf-conifer forest) ＞ MT-1 (evergreen and deciduous mixed forest);(3) Correlation analysis shows that soil erodibility K was positively related to clay content（r=0.709, P=0.291）,silt content (r=0.996, P=0.004), organic matter content (r=0.779, P=0.221)and aggregate destruction rate (r= 0.536, P= 0.464),but significantly and negatively related to sand content (r= -0.997, P = 0.003), however, it did have much to do with soil bulk density and total porosity (r=-0.380, P=0.616; r=0.164, P=0.836).Soil organic matter and silt content were the two main factors affecting soil erodibility K and to a certain extent, soil erodibility could be evaluated by aggregate destruction rate.【Conclusion】The soil erodibility of the study area is relatively high on the whole. As affected by landforms and soil-forming conditions, mixed evergreen and deciduous forest and mixed needle-confierous tree stands are relatively low in soil erodibility K. In the economic production, it is essential to improve the awareness of protection of forest in the regional, prevention of exposure of bare land surface, and implementation of effective soil and water conservation measures，especially in broad-leaf forest land, so as to guarantee successful regional ecological environmental construction and economic development in the study area and even the Zangnan Region.