Abstract: Activated carbon was prepared from bamboo origin by phosphoric acid activation. The effects of different factors such as impregnation ratio, activation temperature, activation time, heating rate on adsorption properties of bamboo activated carbon were studied. The high adsorption capacity of bamboo-based activated carbon with methylene blue adsorption capacity upto 200 mL/g, caramel decolorization rate upto 120% was obtained. Results showing the optimum conditions are: impregnation ratio 3:1(g:g), activation temperature 400℃, heating rate 10℃/min and activation time 40 min. The bamboo-based activated carbons were characterized by SEM and N2 adsorption analysis, indicating that the bamboo-based activated carbon has high BET surface area (2103 m2/g) and developed pore structure.