Abstract: In the face of the tight constraints of carbon reduction under the ‘double carbon’ goal, it has become a broad consensus to promote the low-carbon development of county new urbanization. Based on the panel data set of 149 counties (districts) in Beijing-Tianjin-Hebei region, a comprehensive evaluation index system to measure the level of new urbanization and low-carbon development was constructed. Then, this paper analyzed the spatio-temporal evolution pattern, agglomeration characteristics and coupling coordination degree differentiation through the exploratory spatial data analysis and coupling coordination degree model. Besides, time trajectory analysis was used to transform the law of space-time evolution into the location of regional division of labor. And based on that, four type zones which were coordination demonstration zone, new urbanization promotion area, potential development zone and old-new driver conversion zone were established. Finally, this study proposed the planning response mechanism for each zone to provide theoretical support and practical guidance for Beijing-Tianjin-Hebei counties to promote and improve the new urbanization strategy and achieve the goal of ‘double carbon’ as scheduled.