Abstract: A two-dimensional numerical model based on renormalization group(RNG) k-ε turbulence model was adopted to simulate the influence of polluting sources on the buildings or building group,under single building and three parallel buildings column configurations.Various building configurations and different source positions were simulated,and the pollutant concentration distribution is obtained.It is found out that the pollutant transport and diffusion is determined by the wind speed and local turbulent diffusivity,and the pollutant concentration around buildings is strongly dependent on the position of the pollutant sources and all the buildings.By considering local meteorological conditions and reasonably arranging the position of buildings,the high-concentration area and the dead corner of pollutant can be reduced efficiently.On the other hand,the affected area of high concentration can also be decreased by optimizing the position of polluting sources.By setting the source at the high-speed wind duct, the affected area can be small and the pollutant leaves the building group easily.On the contrary,the affected area is large and the pollutant leaves the building group hardly.