Abstract: Based on the principle of weighted distance discriminant analysis, a classification model of debris flow risk assessment is built. Considering from ten key factors including watershed area, valley length, watershed relative height difference, valley incision density, bending coefficient of major ditch bed, population density, the length ratio of sediment supplement, forest cover rate, the most volume of once flow and frequency. Weights are obtained for ten factors based on entropy method.A model of distance discriminant analysis is established though training debris flow samples which come from the field investigation. The result preferably coincides with the normalization method, it was shown that the model of distance discriminant analysis performed excellently with high prediction accuracy and could be used in practical engineering.

Key words: debris, dangerous degree, entropy method, distance discriminant analysis