To provide gist of air distribution design for subway island-platform and appraise the blue print of air distribution design,a three-dimension model of typical island-platform was constructed.Then it got an appropriate temperature difference for the supply air to optimize the air conditioning system design for subway island-platform.The physical model was set up with standard turbulence.Based on factual heat and wet load,a boundary condition for the simulation was analyzed.The air flow of subway island-platform was simulated with Computational Fluid Dynamics(CFD).The Simulated temperature fields were the same as the tested temperature fields.Then the Computational Fluid Dynamics simulation can simulate and forecast subway island-platform temperature fields accurately with standard model.Thus it can provide gist for air-conditional system design of subway island-platform.