Abstract: An experimental modeling study executed in NJU meteorological wind tunnel was described in this paper. Atmospheric pollution affected by the wast gas from a tower located at downtown of a big city has been simulated. By means of measuring the flow field and flow visualization and dispersion test by releasing the tracer, some conclusions concerning the impact of atmospheric pollution on the local environment have been obtained. Based on the experimental data of the dispersion test, a modificative dispersion model has developed in order to explore the actual approach to predict the air pollutant concentration and its distributions. The results show that fluid modeling in wind tunnel is effective and practical method