“The urban heat island map of Yuelai New City has undergone drastic changes in the past seven years, with the central exhibition city becoming a "heat source center". This article introduces its urban heat island effect and the spatiotemporal evolution of its thermal landscape index in the urbanization process of mountainous new development zones. The Chongqing team used Landsat images to lock in the relationship between evapotranspiration and urban heat island, providing a solution for cooling the mountainous city.”