The construction of thehigh-speedrailway(HSR)systeminChinahas improvedcities’ interconnectedness. We contend that the improved interconnectedness will likely strengthen economic interaction amongcities, particularly cross-border trade integration. Employing aspatialpanelfixed effect error model with prefecture-levelcitydata from 2008 to 2013, this paper evaluates howcities’proximityto the HSRsystemaffectsurbanmarketintegration inChina. We find thatcities’proximityto the HSRsystemexerts a positiv