A multimedia fugacity model (Level Ⅲ) was applied to simulate the concentrations distribution, fugacity reserves distribution and transfer flux of α-HCH and p,p'-DDT in Jinjiang River basin and Quanzhou Bay. Meanwhile, the key input parameters were identified using sensitivity analysis method. The reliability of the fugacity model is verified by the agreement between calculated and measured concentrations in soil, water and sediment. The capacities of the four environmental compartments to hold α-HCH and p,p'-DDT in the following orders: sediment, soil, water and air. The mass of α-HCH and p,p'-DDT in soil and sediment were 97.42% and 99.89%, which is the major sink for α-HCH and p,p'-DDT. The water advection outflow were the major routes for α-HCH and p,p'-DDT disappear in the study area. The main transfer processes of α-HCH and p,p'-DDT is diffusion from water to air and deposition from water to sediment. The results of sensitivity analysis in this study indicated that the logKow had significant influence on α-HCH and p,p'-DDT concentrationsin various media.
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