关键词: 土壤重金属污染, 偏好系数, 组合权, 区间欧氏距离

Abstract: On the basis of the Euclid distance model with weights，and by improving the weighted assignment method and the evaluation criteria，the interval Euclid distance model with combination weights was proposed.Firstly，the objective information entropy method was improved and combined with subjective analytic hierarchy method，while the preference coefficients were introduced to optimize the combination weights.Based on the combination weights and their corresponding measurement data and classification standard interval values of the evaluation index，the Euclid distance of sample and the interval Euclid distance of the evaluation criteria was calculated out，and both distances are contrasted from its similarity to establish the interval Euclid distance model.The comprehensive evaluation of soil heavy metal data in Kangding City is made with the application of the model，which is compared with that of the fuzzy comprehensive evaluation method.The conclusion is that the results of the model are consistent with the actual soil contamination of the area，thus verifying that the application of the Interval Euclide Distance model with combination weights to the evaluation of soil heavy metal pollution is feasible and rational.

Key words: Soil heavy metal pollution, Preference coefficients, Combination weight, Interval Euclid distance