The characterizations of polycyclic aromatic hydrocarbons (PAHs) compositions in the hydrological processes were examined in Camphor forest ecosystems, Zhuzhou, China. The concentrations of PAHs in rainfall above forest canopy, throughfall, stemflow, and surface runoff components were measured by gas chromatography (GC_HP6890). A total of 10 PAHs were detected in rainfall above canopy, and the number of the detected PAHs was 6 and 5 in throughfall and stemflow, respectively. The concentrations of total PAHs in rainfall above canopy was 288.662μg•L^-1, which was approximately 2.8 and 3.5 times as high as that in throughfall (101.901μg•L^-1) and stemflow (82.069μg•L^-1), respectively. The amount and concentration of total PAHs were further decreased in water samples taken beneath the shrub and herb stratums. Compared to the rainfall, PAHs in runoff were lost 87% in composition and 50% in concentration, respectively. Our results demonstrate that the Camphor forest ecosystems have a strong ability for purifying PAHs that are known to be hazardous substances in the environment.