Abstract: Taking mountainous counties in Zhejiang Province as research case, a multi-dimensional evaluation index system for urban-rural integration in mountainous counties was constructed. The entropy weight method was used to determine the weight of the evaluation index system for urban-rural integration in mountainous counties in Zhejiang Province. The standard deviation and coefficient of variation were used to evaluate the temporal evolution characteristics of the urban-rural integration development level in mountainous counties in Zhejiang Province from 2010 to 2020, and spatial-temporal characteristics were analyzed at the subsystem level. Finally, the spatial-temporal geographic weighted regression model (GWTR) was used to analyze the correlation of the main influencing factors. The results indicate that: 1) The urban-rural integration degree in mountainous counties in Zhejiang Province is showing an increasing trend year by year, and the spatial-temporal characteristics of urbanrural integration degree in each county within the region are significant. 2) The level of urban-rural integration development is most significantly improved at the level of spatial integration, while the overall level of industrial integration shows a stable growth trend. The overall development level is relatively low in terms of urban-rural factor integration and urban-rural governance integration. 3) The level of urban-rural integration development in mountainous counties in Zhejiang Province is greatly influenced by urban-rural information exchange, urban spatial expansion, labor factors, economic development level, urban-rural employment structure, and mountain coverage.