To obtain a minimum feeding rate (F min ) of activated carbon (AC), a series of measurements on dioxin emission concentration were carried out in a large-scale municipal solid waste incinerator. It was found that dioxin removal efficiency (η) increased with an increase in AC feeding concentration. This had an almost linear function to F/Q when F/Q was less than 65mg/Nm 3 , where F was the AC feeding rate (mg/min), and Q was the volumetric flow rate of flue gas (Nm 3 /min). However, it did not seem to be affected by F/Q, when F/Q was larger than 150mg/Nm 3 . On the basis of the experimental data obtained in this study, the removal efficiency of dioxins by the application of AC could be correlated as η (%)=100/[1.0+(40.2/(F/Q) 3 )]. It is valid in appropriate conditions (F/Q=10–300mg/Nm 3 ) suggested by the study with a statistical error of ±18%. The correlation would be applied to estimate the dioxin removal efficiency (η) using the F/Q value. For engineering applications, the (F/Q) min could be solved using a graphic illustration method, by which the minimum feeding rate (F) was obtained if the flue gas volumetric flow rate (Q) was known.