Abstract: The Guidelines for Environmental Impact Assessment of atmospheric environment (version 2008) has recommended SCREEN3 estimation model for the atmospheric evaluation scales and scopes.The model can be used for the estimation of atmospheric evaluation scales and scopes of point sources,area sources,line sources and body sources,but can't be used for the projects of natural draft cooling towers (NDCT).AUSTAL2000 model and meteorological observation data in 2016 were used to simulate the pollutant concentrations on various leeward axials under 1296 groups of meteorological conditions.Then the seasonal maximum ratios of ground concentrations (Pi) for different pollutants and the longest distance (D10%) corresponding to the 10% of the standard limit of the ground concentrations were selected to evaluate the seasonal atmospheric scales and scopes.The results show that the atmospheric evaluation scales of NDCT project are most second scale.The atmospheric evaluation scopes vary with the estimation of seasonal meteorological data,with the largest one in summer,the second largest ones in spring and autumn,and smallest one in winter.