The influence of the opening of the high-speed railway from Beijing to Shanghai on the spatial interaction between cities in Jiangsu province is studied here using the improved gravity model and the breaking-point formula to calculate the relevant data of the cities in the year before (2010) and the year after (2012) the opening of the Beijing-Shanghai high-speed railway. The spatial interaction between cities in Jiangsu and the total amount of external attraction of each city are analyzed by ArcGIS. The spatial interaction between cities in Jiangsu is further analyzed by vertical and horizontal comparisons. The conclusions show that the opening of the Beijing-Shanghai high-speed railway had a significant impact on the region, and increases competition among cities in Jiangsu while promoting coordinated urban development, which provides support for the development of high-speed railway in the future.
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