Abstract: Thermal environment is one of the important factors affecting urban ecological environment. How to minimize the negative impact of thermal environmental problems through rational urban planning is one of the key issues to be solved in urban planning. Based on the change of land use in urban planning, this study used WRF model (Weather Research and Forecasting model, WRF) to simulate near-surface air temperature of Jiangbei New Area in Nanjing city, thereby analyzed the response of the thermal environment to urban planning. The obtaining results were as follows: (1) The use of land use data with high spatiotemporal resolution could significantly improve the accuracy of near-surface air temperature simulated by WRF model. On this basis, the coupled urban canopy model could simulate the near-surface air temperature change more accurately. (2) Thermal environment was significantly affected by the land use change in urban planning. The magnitude of temperature change in the urban land expansion varied over different periods of time, with the maximum increase amplitude of 1.8℃ in the period of 20∶00-22∶00. Compared with natural surface, the urban land was characterized by rapid-warming and slow-cooling. (3) Compared with 2013, the urban heat island in the study region expanded and the urban heat island intensity increased in 2030. Therefore, it is suggested that in addition to controlling the growth of urban land effectively, it is necessary to consider the decentralized layout of urban land in urban planning. It is more beneficial to minimize its impact on thermal environment, which is more conductive to the ecological planning and construction of Jiangbei New area.