Abstract: High absorption performance activated carbons were prepared from sisal fiber waste by phosphoric acid activation. The inference of mass fraction (ω(H3PO4)), impregnation ratio, activation temperature and heating time on adsorption properties of activated carbons were investigated. The obtained activated carbons were characterized by Nitrogen adsorption-desorption isotherms, thermo-gravimetry (TG) and scanning electron microscope (SEM). It was found that the order of factors that influence adsorption properties was: activation temperature>activation duration time>ω(H3PO4)> impregnation ratio. The optimal pretreatment and activation conditions are: ω(H3PO4) 50%, impregnation ratio 1.5:1, activation temperature 400℃ and heating time 70min. The yield of the activated carbon is 35% with the properties of the sample is as follow: specific surface area (SBET)1877m2/g, total pore volume 1.87cm3/g, average pore diameter 4.0nm, iodine number (QI2) 1051.1mg/g, amount of methylene blue adsorption (QMB) 225mg/g.