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长江上游泥石流危险度区划属类型区划．其遵循的是相对一致性，定性指标与定量指标相结合，主导因素，以及综合分析四个原则，区划的指标有：１．自然指标，即统计单元内泥石流发生发展的环境条件──地貌、地质、气温和降水各自的综合评价值；２．经济指标，即统计单元内区域经济发展程度──单位面积上的社会生产总值，人均收入值，工业产值与社会生产总值之比值，以及交通发展程度系数．对环境条件和经济条件分别作了因素分析和相关分析，以进行泥石流危险度区划．
Debris flow hazard classification in the upper reaches of the Yangtze River belongs to the type zoning. It follows the relative consistency, the combination of qualitative and quantitative indicators, the dominant factor and the four principles of comprehensive analysis. The indicators of the division are as follows: 1. Natural indicators, that is, the environmental conditions for the development of debris flow in the statistical unit ─ ─ the comprehensive evaluation value of the landform, geology, temperature and precipitation; Economic indicators, that is, the degree of regional economic development in the statistical unit - the ratio of GDP per capita, per capita income, the ratio of industrial output to total social production, and the degree of traffic development. On the environmental conditions and economic conditions, respectively, made a factor analysis and correlation analysis to carry out debris flow hazard division.