A level Ⅳ multimedia fugacity model was established to simulate the fate of p,p'-DDT and γ-HCH in special climatic conditions,such as in the high temperature and humidity environment of the Pearl River Delta,China. The law of migration and transformation of p,p'-DDT and γ-HCH were approached by the Ⅳ multimedia fugacity model,corrected for time and temperature change during 1952-2030. The simulation results showed a better response of the variation of pollutant concentrations to the changes in the pesticide...