Eco-city research has been given close attention during the past decades, and the evaluation of it has become a key part. According to the research results of eco-city evaluation at home and abroad, an evaluation index system has been established, including resource and environment, economy, socio-culture and management. On the basis of the index system, fuzzy matter-element model is used to evaluate eco-city. Taking 9 provincial capital cities as an example, which located in the western of China, the evaluation result shows that it is fairly consistent in actual situation of eco-city construction. So the index system and the model are proved to be effective and feasible, which will be helpful to eco-city's evaluation and construction in the future.