Graft polymerization of acrylic acid on bamboo fiber using ceric ammonium nitrate (CAN) as initiator in aqueous medium has been studied. Infrared (IR) spectroscopy was used to confirm the graft copolymer formation. Some effect factors on the graft reaction were also studied in detail. The optimal condition for grafting acrylic acid (AA) onto bamboo fiber was CAN M, AA 10 g, HNO M, temperature 45o C and time 240 min.