In thus research, the kinetics of paraquat degradation in a medium of Oematnunu soil filtrate medium at two conditions, i. e. light condition and dark condition (on direct sunshine for 8 hours per day) has been studied. to study the effect of sunshine in paraquat degradation, it gas been carried out a paraquat degradation in medium of sterilized aquadest, sterilized well water, sterilized Oematnunu soil filtrate, medium without sterilization like, medium aquadest, medium well water and medium Oematnunu soil filtrate without sterilization. on certain time interval, the rest of paraquat was determined by UV-Vis spectrophotometry after being reduced with sodium dithionite at a maximum wavelength of 604 nm. the results indicated that sunshine increased the rate of paraquat degradation. paraquat degradation studied medium followed kinetics of the first order. the rate constant of paraquat in Oematnunu soil filtrate medium (0,06998 0,00336 /day). higher than that in medium without sterilization and anothers sterilization medium, as well as in well water medium (0,06217 0,00317 /day), aquadest medium (0,03458 0,00252 /day), for anothers sterilized medium as Oematnunu soil filtrate medium (0,06086 0,00285 /day), sterilized well water medium (0,04720 0,00182 /day) and sterilized aquadest medium (0,03472 0,00251 /day).