Abstract: In order to get the optimum conditions for photodegradation experiment, the effects of various factors, including soil pH, Dissolved Organic Matter（DOM）, water content, soil depth, exogenous components and husbandry on the degradation performance of 2,2-bis(4-Chlorophenyl)-1,1,1-trichloroethane （DDT） were studied by choosing the brown soil samples spiked with DDT and exposed to the UV-light irradiation. The results indicated that the degradation rate increases with the increasing of the water content of the soil, but when it exceeds over 50%, the degradation rate decreases. The photocatalytic degradation rate of DDT increases with the rising of the concentration of DOM, however, when the concentration of DOM exceeds over 1.0%, the degradation rate reduces slightly. Acidic or alkaline environment is more effective for the photodegradation than the neutral environment.Fe and TiO2 greatly accelerate the photodegradation of DDT in soil, DOM, Fe2O3 and all element fertilizer+DOM slightly positively influence the photodegradation, while the all element fertilizer scarcely provides contributions. The degradation rate of DDT decreases with the rise of the soil depth; regular husbandry can enhance the degradation capacity of DDT effectively.