The evaluation of urban sustainability plays a crucial role in the process of the sustainable development of cities. To decrease subjectivity and attain a comprehensive evaluation, this paper develops an evaluation method using the technique for order preference by similarity to ideal solution (TOPSIS). First, an evaluation index system including 39 indices and three categories (economic, social, and ecological development) is established; second, based on the index system, a modified TOPSIS, in which the entropy method is used to assign weights to each index according to its evaluation score and grey relation analysis is used to reduce the uncertainty existing in the process of evaluation, is presented to rank the sustainability level of cities. Finally, an example with the sustainability evaluation of 16 cities in the Anhui province of China is introduced to verify the effectiveness of the model.

The traditional manufacturing industry has brought rapid economic development while worsening environment in recent years. In order to realize low-carbon and sustainable development of manufacturing industry, the relevant national departments have proposed to build green manufacturing system and assess the products green level the as one of the most important indicators of this. From the perspective of the products whole life cycle, taking the electronic products as the research object and combining with the green manufacturing requirements, the green level assessment indicators are established. Taking the MA-OWA as weighting method, and using the modified TOPSIS method, the electronic products' green level was assessed. And the results show that the high green level and low environment impact of electronic products can be effectively selected, which is conducive to the sustainable development of the environment.