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The application of atrazine in China during the last ten years has led to some environmental problems. In this paper, the multimedia model of atrazine in soil-plant-groundwater system atBaiyangdian Lake area in North China was established using a fugacity approach, and verified with observed values. The model involved 7 environmental compartments which are air, groundwater, soil, c roots, c stem, c leaf and kel of c. Theresults showed that the relative errors between calculated and observed values have a mean value of 24.7%, the highest value is 48% and the lowest value is 1.4%. All these values indicated thatthis multimedia model can be used to simulate the environmental fate of atrazine. Both the calculated and observed values of conce ntrations of atrazine in plant compartments are in the ollowing order: in c roots > in c stem > in kel of c > in c leaf, it exhibited a good regularity. The prediction results indicated that concentrations of atrazine in the roundwater and kel of c will override the limitation of 3L and 0.05 mg/kg respectively.