["Review of Development Economics, EarlyView. ", "\nABSTRACT\nOver the last decade, China's High‐Speed Rail (HSR) network has expanded rapidly, raising important questions about its economic implications. The purpose of this study is to explore the impact of HSR on urban economic growth, with a particular focus on labor mobility as a transmission channel. In terms of research methods, to better capture HSR connectivity, a network‐based measure of degree centrality is introduced, which provides a more accurate representation of intercity linkages. Based on this measure, an econometric model is employed to conduct empirical analysis. The results indicate that HSR significantly boosts cross‐regional labor inflow in the tertiary industry, driving urban economic development, while its effects on labor in the primary and secondary industries are negative or insignificant. The impact differs by city type: in developed cities, HSR primarily promotes the tertiary industry through labor inflows, whereas in developing cities, it attracts labor to both the secondary and tertiary industries. These findings contribute to the understanding of how transportation infrastructure shapes urban economies, revealing heterogeneous mechanisms across industries and cities.\n"]