Abstract: Abstract：Groundwater is the main source of water supply in many cities of China, and it has been polluted in different degrees, leading to intense contradiction between the supply and the demand of groundwater resources. Research on the groundwater pollution early-warning method plays an important role in the protection of groundwater resources. At present, the early-warning of groundwater in research methodology at home and abroad is still at the exploratory stage, and the sophisticated warning system has not been developed. The research status and problems of the early-warning method of groundwater pollution were analyzed in this paper, the groundwater pollution early-warning method based on a numerical model was studied in a chromium residue site in northern China, and different early-warning grades were zoned by the model. The result of the study provides scientific basis for regional groundwater pollution prevention and control planning.