Abstract: It is of great significance to clarify the coordination mechanism between county urbanization and rural sustainability for implementing the idea of urbanization construction with the county as the carrier. Based on the remote sensing data of land use and related statistical data, the spatial-temporal evolution characteristics and corresponding driving mechanism of coupling coordination between county urbanization and rural sustainability in Jiangsu from 2000 to 2020 were analyzed, by using the coupling coordination degree model, relative development degree model and geographical detector. The results showed that: (1) The county urbanization, rural sustainability and their coupling coordination were gradually optimized. The coupling coordination degree had completed the leap of ‘antagonistic stage→running-in stage→coordination stage’, presenting the spatial pattern of ‘high in the south and low in the north’. （2) The types of coupling coordination mainly included rural sustainability lagging type and synchronous development type, and generally were experiencing the evolution process from low-level type to high-level type. (3) The spatial-temporal evolution of coupling coordination was mainly driven by the factors such as economic development, government behavior and openness. And the interaction of internal and external factors realized the multiplier effect of coupling coordination degree. Based on the research results, policy suggestions were put forward from the aspects of differential path construction, cross-regional linkage and multi-agent coordination to promote the integration and symbiosis of urban-rural areas.