Abstract: To provide a reference for the airdistribution design ofa subway side-platform and appraise the blue print of an air distribution design, a three-dimensionalmodel for typical side-platformswas constructed to got an appropriate supply air temperature difference to optimize the design of an air conditioning system of a subway side-platform. The physical model is the standardk-εturbulence mode.l Based on actual heat load and wet load the boundary conditions for the numerical simulation were determined. The air flow ofa subway side-platform was simulatedwith CFD (computational fluid dynamics). The result shows that the simulated temperature field is the same as the tested temperature field. This indicates thatCFD can simulate and forecast the temperature field ofa subway side-platform accuratelywith the standardk-εmode,l and then provide a reference for the design of the air- conditioning system of subway side-platforms.