Abstract: From the viewpoint of ecology,this paper analyzed the principal part and major points of urban ecological environmental system in Nanjing,and established the evaluation indices related to the ecological environment.By layered processing the evaluation indices,the indiecs system of urban ecological environmental quality was established,and the significance and function of this system was explained.Analytic Hierarchy Process (AHP) was applied to judge the weight of each evaluation index,and to calculate the comprehensive assessment values of  evaluation indices system.The urban ecological environmental quality level was graded according to the comprehensive assessment values,and the results were actually coincided with the situation of Nanjing.Overall,the ecological environmental quality of Nanjing was improved step-by-step,the environmental pollution was obviously lessened,but the natural environment was gradually worsened,especially under the influence of natural disasters.This study established an effective method for the ecological evaluation of urban environment,which would benefit to the establishment of ecological cities in China.

Key words: Broadleaved Korean pine forests, Eco climatic suitability, Temperature water effect function, Climate change, Assessment