Abstract: Soil erodibility is an essential parameter in the model for predicting soil erosion and also the basis for quantificative study of soil erodibility. Based on the data of soil particle-size distribution, soil map, soil physical and chemical properties in the Second Soil Investigation of Hebei Province. The veracity of the modified logistic growth model with two parameters and the conversion of soil texture scheme from the Katschinski to the USDA were studied, the soil erodible K value was calculated using the formula method and the K value map well registered with the topographic map was made, in which accurate geographic position could be located. Meanwhile, the area with soil erodible K value between 0.25 and 4.0, the erosion and relative erosion soil was about 58.6% of the total area in this province. Applications of the K value and map were also discussed.

Key words: Logistic growth model, Conversion of soil texture, Soil erodibility , Map of K value