Abstract: Activated carbon was prepared by fluidization progress from sawdust charcoal using water vapor as activator. The factors effects on properties of activated carbon such as activation temperature, carrier flow, water vapor flow, feed rate were studied. The optimum conditions obtained by the orthogonal experiments are as follows: activation temperature 870 ℃, carrier flow 250 m3/h, water vapor flow 150 m3/h, feed rate 54 kg/h. Under these conditions, the product yield is up to 31.62 % with the iodine adsorption up to 1 162 mg/g. The analysis of variance showed that the activation temperature is the only significant impact factor for product yield. The impact factors such as activation temperature, water vapor flow and carrier flow are significant for the iodine adsorption.