The purpose of this study was to determine whether Vermi Cast could be used effectively to remove $SO_2$ from flue gas, and then to investigate optimum adsorption conditions. The Vermi Cast used as adsorbent was mechanically screened with 8~20 mesh sieve. The adsorption data for $SO_2$ were regressed using the Freundlich isotherm. The fit was generally satisfactory ($R^2$=0.945~0.982). With the temperature changes from 2$0^{circ}C$ to 4$0^{circ}C$, the constant k in Freundlich isotherm qe= $kCe^{1/n}$, decreased from 1.409 at 2$0^{circ}C$to 0.297 at 4$0^{circ}C$, and the exponent 1/n were decreased from 0.343 to 0.134. With the bed depth changes from 10cm to 30cm, the adsorption capacity expressed as mmol of $SO_2$ adsorbed per g of Vermi Cast increased from 0.247 to 0.381. Moisture content is an important parameter in the $SO_2$ adsorbed were observed over 0.3mmol $SO_2$ /g Vermi Cast. The best adsorption capacity was 0.487mmol $SO_2$ /g Vermi Cast, and it was obtained with moisture content 37%, temperature 2$0^{circ}C$. From the above results, ti might be concluded that Vermi Cast is effectively as a good adsorbent to remove $SO_2$ from flue gas.