Palladium nanoparticles were synthesized with palladium(‡U) chloride, trisodium citrate dehydrate, and sodium borohydride under stirring condition. Palladium-graphene nanocomposites were prepared with palladium nanoparticles and graphene were taken place with polyallylamine under stirring condition for 1hr and irradiated ultrasonic for 3hrs. Palladium-graphene nanocomposites were heated in an electric furnace at 700�Ž for 2hrs and characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Palladium-graphene nanocomposites were examined as a catalyst to reduce 2-nitrophenol, 3-nitrophenol, 4-nitrophenol into 2-aminophenol, 3-aminophenol, 4-aminophenol with sodium borohydride by UV-vis spectrophotometer. References 1. W. Lu, R. Ning, X. Qin, Y. Zhang, G. Chang, S. Liu, J. Hazard. Mater. 197 (2011), 320-326. 2. M. Rezaei, S. H. Tabaian, D. F. Haghshenas, Electrochim. Acta, 87 (2013),381-387.