Abstract: Based on the CALPUFF source code, this paper uses C# language to develop the computing software based on the model system. It solves the problems of the complicated setup of CALPUFF parameters, the difficult writting of input files, and lack of Chinese support in the software. On the basis of GIS, the visualized output of atmospheric pollutants in space was realized, which provided a more convenient and feasible means for predicting and simulating the diffusion of atmospheric pollutants using CALPUFF.