The soil resources evaluation methods and the definition of the evaluation factors weight

The soil resources evaluation methods and the definition of the evaluation factors weight have been summarized. The benefits and shortcomings of the objective evaluation(principal component analysis，factor analysis law,grey incidence law and entropy value law)and the subjective evaluation(Delphi’s law and AHP's law)are also appraised,showing that the subjective evaluations has the decision person’s subjectiveness and the objective evaluations is short of the wish of policy makers.The comprehensive collection of subjective and objective informations should be a new way of the soil resources evaluation and the definite of the evaluation factors weight.