Abstract:

From the viewpoint of complex ecosystem，an assessment index system of urban ecosystem health was constracted，and an attribute synthetic assessment model was established based on the attribute hierarchyrecognize model. Taking the Nan′an District of Chongqing as an example，we use the models and methods to make evaluation for urban ecosystem in the Nan′an District of Chongqing. The results show that the current situation of the ecosystem in the Nan′an District of Chongqing belongs to subhealth. In accordance with the results of the evaluation，it analyzes the health evaluation attribute index of the Nan′an District of Chongqing. It shows that the Nan′an ecosystem is in transition phase with a number of limiting factors of health. In order to guide a healthy urban ecosystem development，it must rely on scientific and rational method of planning and implementation. From a longterm consideration，in order to improve the urban ecosystem health，corresponding control measures and methods were put forward.

Key words: attribute hierarchy-recognize model/ urban ecosystem/ health assessment/ the Nan′an District