Abstract: In this study, a methodology for determining three-dimensional distribution of pollutant contribution sensitivity on a city scale was developed based on the source identification module of the CAMx model. The source apportionment technology was applied to Tangshan, which is characterized as a heavy industrial city. We set a baseline scenario with 9 km grid resolution and a 1000 t/a increase of sulfur dioxide emission scenario at elevations ground, 70, 130 and 200 m to analyze the numerical simulation results of the regional contribution sensitivity coefficient matrix in January 2006. The hourly resolution pollutant contribution coefficient matrices of each level grid to the whole Tangshan city and its urban areas were obtained. Statistical analysis and GIS visualization techniques were used to analyze the three dimensional spatial evolution of pollution contribution sensitivity on the city scale. The results indicate that the method can be used for quantitatively calculating the grid contribution of different vertical layers to Tangshan, and it has obvious advantages. It is also helpful to establish environmental planning and management projects.