In this paper, the method of torrefaction-fast pyrolysis-physical activation' was conducted to investigate the impact of torrefaction on the properties of activated carbon through CO2 activation. It was found that torrefaction had a significantly positive influence on the quality of activated carbon and 280 degrees C was the optimal torrefaction temperature. The activated carbon obtained under the recommended condition had a higher yield (13.0 +/- 0.3% based on dried rice husk) and most developed pore structure (specific surface area of 1090.7 m(2)/g). The results may be helpful for the potential utilization of high ash content biomass like rice husk.