中文摘要：

在对环境系统脆弱性概念进行界定的基础上,从资源型城市环境系统对区域环境因素敏感指数和适应指数两个方面构建了脆弱性评估模型,并对中西部20个地级以上典型资源型城市进行了评估。在综合考虑不同资源型城市环境系统脆弱性特征的基础上,根据脆弱性得分划分为严重脆弱、一般脆弱、轻微脆弱3种类型。研究结果发现,从分布区域来看,中部环境脆弱性小于西部;从城市资源类型来看,脆弱性依次为：有色金属城市〉煤矿城市〉石油城市〉黑色金属城市。

英文摘要：

On the basis of analysis of the fragility of the environmental system,the paper has constructed models for assessments from two aspects,the sensibility index and adaptation index,which are all based on the factors of the regional environment.Further more,20 typical cities with resource-based economies were assessed on the ground of the fragility of these cities,thereafter,divide them into 3 types： serious-fragility,medium-fragility,and mild-fragility.The result shows that the environment in the middle area of China is less fragile than that in the west area,and the reasons may sum into two points： firstly,the environment in the west area is relatively bad;secondly,the local government fail to take the problem very seriously.The fragility of the different types of resources-based cities can be sorted as follows： the nonferrous metal city,the ferrous metal city,the petroleum city and the colliery city.Since the varieties in types of resource and extraction,the degree of contamination is also different.Additional,investments on environment is various on the ground of the city＇s economic position.According to the analysis of the environment situations in different cities,it put forward some plans for the sustainable development of those cities with resource-based economies for reference only.