Spatial spillover and heterogeneity impact of High speed Railway on County level Economy in China:An Empirical Analysis Using the SDID Model

This research delves into the profound implications of high speed railway station construction on regional economic development in China. Employing the SDID model, the study meticulously analyzes the opening of high speed railway stations and its subsequen t impact on county level economies. The findings, drawing from empirical data, underscore the following pivotal conclusions: Firstly , the study establishes a positive correlation between the introduction of high speed railway stations and economic growth a t the county level. Beyond the direct impact, the research illuminates the existence of spatial spillover effects, affirming the transformative influence of high speed railway station construction on county economies. Secondly , the investigation reveals that high speed railway station openings play a crucial role in the upgrading of industrial structures within counties. This effect is particularly pronounced in central and western regions, emphasizing the broader implications for economic activity concentr ation and growth in both primary and tertiary industries. Thirdly , the study highlights the nuanced nature of the impact of high speed rail construction, contingent on regional characteristics such as existing infrastructure, population density, and industry structure.Policymakers are urged to consider these local nuan ces for effective planning and implementation.