Under the background of the development of the new normal economy, resource-based cities are faced with many problems, such as the monotonous industrial structure, the pressures on resources and the environment, and so on. In order to enable resource-based cities to develop in a green and healthy manner, it is necessary to conduct research on sustainable development under the new normal economy conditions. This article starts from the analysis of the development of resource-based cities under the new normal economy. Taking Hegang City as an example, select the data from the 2007-2016 decade, use the AHP and Factor Analysis comprehensive evaluation method to carry out sustainable economic development evaluation of Hegang City under the new normal economy, analyze and make recommendations, finally put forward the specific implementation path for the sustainable development of Hegang City under the new normal economy. The results show that achieving sustainable development is an inevitable choice for the development of resource-based cities under the new normal economy. During the ten years, the overall level of sustainable development in Hegang City under the new normal economy has shown a trend of first increase and then a steady trend. In recent years, the economic and resource subsystems have obviously obstructed effects. Under the new normal economy, the proposed sustainable development path of Hegang City must closely integrate the new normal economic characteristics with the concept of sustainable development, start from the actual conditions in Hegang City, the rationality of the specific implementation path can be guaranteed.