In order to assess the health level of an urban ecosystem, this paper has brought forth a set of relatively integrated assessment indices from three typical respects of urban ecosystem - structural function, ability of sustainable utilization, and dynamic change, and then endowed weight to these indices by entropy weight method to establish an assessment model of fuzzy mathematics.
Firstly, the situation of urban ecosystem health in Chongqing as a study case was comparatively assessed with those of other three cities-Beijing, Tianjin and Shanghai. Assessment results indicated that the four cities were situated at sub-healthy state; the integrated level of urban ecosystem health decreased in the following sequence: Shanghai, Beijing, Tianjin, Chongqing. Secondly, yearly dynamic change assessment of ecosystem health of Chongqing from 2001 to 2004 was also carried out. Results showed that condition of urban ecosystem health was developing from sub-healthy state to healthy state. Finally, the paper investigated the present conditions of ecosystem health levels of nine districts in Chongqing Metropolis and listed a decreasing sequence of the integrated level of ecosystem health as follows: Yubei, Nan'an, Yuzhong, Banan, Jiulongpo, Jiangbei, Shapingba, Dadukou, Beibei.
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