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The problems resulted from the diffusion and controls of indoor pollutants in spacious buildings are mainly discussed in this paper. Firstly, the method of indoor air quality evaluation and indoor contaminant emanation forecast is introduced. Secondly, with the help of a large industrial factory building, the influencing factors for the diffusion of indoor pollutants are simulated by using the CFD software, including the different modes of air-flow organization, the variant fresh air ratio and the varied diffusion velocity caused by different air-flow organizations, at the meantime, some diagrams about the temperature, relative humidity, velocity and the concentration fields are obtained in the process of simulating, and then, the indoor air quality is evaluated according to the analysis results in different conditions. Finally, the desirable mode of the air-flow organization fitting for spacious buildings is studied out.
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