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According to the complexity and the uncertainty of emergent water pollution incidents in a basin, and the demand of the rapid visual access to the future pollution condition on emergency decision-making platform, this paper puts forward the fast forecasting and simulation of water pollution diffusion events platform based on the Multi-Agent modeling, the grid technology and 3S technique. First form a square grid Agent system which contains multiple Water Agent, and the Water Agent was used to describe and depict the spread phenomenon of pollutants, and then a remote sensing intelligent grid was built based on Agent to manage the vast and distributed image data of the basin, meanwhile, the high performance computing power was offered to a huge number of Water Agent containing pollutants by the use of the grid middleware. On this basis, the contaminant transport process was fully displayed by 3S technique, finally, the platform was applied to an emergent water pollution incidents of Weihe River. The results show that the platform, which can rapidly simulate the emergent water pollution incidents of the basin, is reasonable and effective.