Abstract: The aim of the paper is to make a comprehensive risk evaluation of potential hazard from Haze weather.We constructed the evaluation system of indicating factors which consists of 21indicators in 3categories on the basis of disaster systemic theory.We combined the Analytical Hierarchy Process(AHP)and the entropy approach to determine these indicators’weight.With the indicator system and its weights in hand,we calculate the correlation coefficient of comprehensive risk of haze pollution of three provinces in in Yangtze River delta district.The results indicated that the security risk level of Shanghai Jiangsu and Zhejiang isⅣ,Ⅱand Ⅰrespectively.The evaluation result based on matter-element extension model was accord with the result of traditional comprehensive index evaluation method,which proved that this model was reliable.In addition,we classified evaluation index in terms of weight,security level and improve difficulty,and find key index to reduce the risk level quickly.

Key words:

"> Haze, Comprehensive risk assessment, Matter-element extension model, Relation coefficient