Comprehensive Evaluation for Cities' Ability of Reducing Earthquake Disasters Based on Cloud Model

In order to solve the problem of lacking of accurate foundaion data which results in fuzziness and randomness in evaluating cities' ability of reducing earthquake disasters,a comprehensive evaluation method based on cloud models is expatiated in this paper.A new mathematical representation of qualitative concepts is represented by cloud models.With the new models,mapping between qualities and quantities becomes much easier and interchangeable.Fuzziness and randomness are integrated using digital characteristics,such as expected value Ex,entropy En and hyper entropy He.The fuzziness and randomness are not only complementary,but also inseparable.It starts with the uncertainty of the system,then the theory of Analytic Hierarchy Process for reference is used.And it makes the result of evaluation more accurate when used to analyze cities' ability of reducing earthquake disasters.