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Refuge floor is used as a temporary safe space for evacuees resided in high-rise building under emergency case, e.g., fire situation. The provision of refuge floor is a prescriptive requirement in the fire code of Hong Kong. Such a provision is desirable by regulators as it relates to simple rules and has administrative convenience. However, the safety of refuge floor under fire situation may be impaired if the floor is affected by smoke from other levels. The code prescribes that cross-ventilation should be provided in refuge floor so as to prevent smoke logging. Nevertheless, the adequacy of such measure and the influence of such open floor on the rest of building have not been analytically studied. In this paper, a Computational Fluid Dynamics (CFD) method is employed to analyze the airflow field around and inside a refuge floor. The aim of the study is to predict the airflow field inside and around a designated …