By sampling soils at different elevation at lower reaches of Jinsha River in Ningnan County

variations of soil erodibility with elevation were studied by statistical analysis and indoor physical-chemical properties analysis.Results indicated that in the dry-hot valley

elevation had significant effect on soil physical chemical properties

particle composition and soil erodibility.In the lower elevation region where dry-hot wind had great effect

both soil physical and chemical properties was improved with the increase of elevation

and soil erodibility decreased too;elevation between 1235 m and 1400 m could be considered as the transition region.When the elevation was over 1500 m

influence of dry-hot wind almost disappeared

vegetation types changed a lot

and soil erodibility decreased significantly.These results verified that in the Jinsha River dry-hot valley

dry-hot wind was one of the main factors that influence the soil erodibility.Thus it was important to adopt proper measures to reduce the influence o f dry-hot wind

and increase the anti erodibility of land by soil and water conservation measures.