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High-speed railway station has a large space and a large amount of air infiltration, which has great influences on the thermal load, the thermal environment and the air quality. In this paper, the air infiltration and its distribution characteristics in winter and summer in different climatic zones are determined by CO2 concentration method. The results showed that buoyancy-driven pressure played a dominant role, and the infiltration air volume of 2.8 h-1 in winter is larger than that of 2.0doi:10.1051/e3sconf/202126103041 doaj:bcf51eed20834aacbd5a956c36f0d9a2 fatcat:exmb6catfrguno2xvyk37gdhk4