Soil samples of two cultivated red soils developed from weathered parent materials of quaternary red earth and granite were collected in eastern suburbs of Changsha City.Soil particle composition and soilorganic matter were obtained by means of laboratory analysis.Then,soil erodibility factor Kvalue was calculated using Nomogragh model,modified Nomogragh model,EPIC model,geometric mean particle modeland Torri model.Finally,the calculated soil erodibility value was compared with the measured soil erodibility factor Kvalue by the Red Soil Ecological Experimental Station of the Chinese Academy of Science in Jiangxi Province.Results showed that Torri model and geometric mean particle model are more suitable for calculating the Kvalue of red soils developed from quaternary red earth in the eastern suburb of Changsha City,whereas EPIC model,geometric mean particle model and Torri model are suitable for calculating the Kvalueof red soils developed from weathered granite materials.