The transformation of resource-based city is a worldwide problem. China has 118 resource-based cities,50 of which have been showing signs of resource failure. The pressure on the transformation of China's resource-based city is self-evident. In this paper, taking Baiyin city as an example, I made an in-depth study on the transformation of resource-based city. After elaborating theories on urban functions, I analyzed the formation of Baiyin city and its urban functions, characteristics of the evoluti...