Abstract: A kind of active coke (AC-A) for SO2 removal from flue gas was directly produced from a large scale fluidized bed gasifier. The desulphurization behavior and characteristics of the active coke (AC-A) were investigated under different conditions and compared with a commercial active coke (AC-B) with approximate saturated sulphur capacity. It is found tht adsorption temperature has complicate effect on the adsorption behavisor of AC-A produced. AC-A has a maximum sulfur removal ability at 100 ℃. It is not surprised to see a short adsorption period of AC-A with the increase of gas hourly space velocity (GHSV) or SO2 concentration. There are suitable values of oxygen concentration (about 6%) and steam concentration (about 10%) for AC-A to obtain high sulfur removal ability. AC-A prepared shows higher desulfurization ability than commercial AC-B at the same adsorption conditions. Meanwhile, the desulphurization ability of regenerated active coke AC-A is also better than that of regenerated AC-B after every regeneration courses. This kind of active coke can be potentially used in the flue gas desulfurization, though efforts are needed to modify it.