Cellulose from flax shive was separated and modified with epoxychloropropane and triethylamine，and utilized as an adsorbent for the removal of reactive turquoise blue (RTB) from aqueous solutions. The surface morphology and functional groups of the adsorbent were analyzed using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The effects of contact time，adsorbent dose，initial concentration of dye and pH on adsorption of RTB were investigated. The results indicated that the adsorption capacity increased with increasing contact time and reached equilibrium after 180 min. Raising temperature is beneficial for adsorption. The maximum adsorption capacity of modified cellulose from flax shive for RTB was 198.45 mg/g at 40 ℃. The adsorption capacity was large at high initial concentration of dye. The adsorption was significantly affected by pH of solution.