In this paper, airflow distribution characteristics at floor level in a slot-outlet and slot-inlet ventilated (SOSIV) room was compared between CFD simulation and available measurement results (Wang et al 1996). With two different outlet/inlet location ,6 levels of diffuser height and supply velocities , total 48 cases　 were simulated under isothermal and nonisothermal conditions. For both the vertical velocity profile and horizontal velocity distribution at floor level, the simulation results were shown to be in good agreement with available experimental data. However, calculated maximum floor-level velocities were 5% and 10% less than the measurement data for isothermal cases and nonisothermal cases, respectively. This could be result of the maximum velocities often happened near the floor and the stand are k-εmodel is poor to predict airflow in this area.