Adsorpiton experiments of mercury compounds by sulfur-impregnated activated carbons have been performed using by-passed flue gas from a real waste incinerator. Using commercial grade sulfur-impregnated activated carbons, the removal efficiency of mercury compound was 97% at temperature of 80 ℃. The sulfur-impregnated activated carbon also showed the similar level at high temperature, 140 ℃, mainly due to the chemical adsorption (chemi-sorption) effect increasing with temperature increase. With the initail mercury concentration higher than 200 ㎍/Nm3, the mercury concentrations after two stages was lower than 10 ㎍/Nm3, which is low enough compared to the German regulation limit on mercury in the incineration flue gas, 30 ㎍/Nm3. The cumulative removal efficiency of the two stages(the first and the second) was 95%. However, the mercury concentration cannot be lower than 10 ㎍/Nm3 in this fixed-bed adsorption facility, and the overall mercury removal efficiency was limited. The pressure drop at this fixed adsorption bed was between 46 and 82 mmH2O for the serial flow configuration, and became as small as 26 mmH2O for the parallel flow configuration.