Based on theory of extenics research assessment and classification of Soil erosion

The article sets the soil erosion of Nong´an county in Jilin Province as an example,and tries to use extenics theory to evaluate it. According to the analyzing methods of the euthenics theory, the article builds up the model of classical and extensional of soil erosion on the basis of matter-element. Through the calculation of correlativeness of assessing index, the article evaluates 30 places which have soil erosion and gets the conclusion corresponding to the fact. It proves that using the method to evaluate soil erosion is available.