The model set up with quantification theory II had the good results in differentiating the grades of soil erosion intensity. When the model was used in distinguishing the soil erosion intensity of 88 samples participating in setting up the model, its differentiating accuracy ratios for intensive, median, slight and insignificant erosion groups were 100%, 91.3%, 83.3% and 93.8% respectively; total accuracy ratio was 92%. When it was used in differentiating the soil erosion intensity of 10 samples without participating in setting up the model, its accuracy degree was 90%.