In order to maintain the freshness of fruits and vegetables, controled atmosphere(C.A) storage has been used for a long time. But the ethylene gas produced by breathing of fruits and vegetables makes them hard to keep the freshness, promotes the aging of them. In this study, adsorption behavior, adsorption amount and adsorption equation of ethylene gas in low concentration by uslng activated carbon were studied. It was observed that the amount of adsorption was increased with more activated carbon and with slower flow rate. But it was not explained with Henry's equation and Freundlich's equation. Therefore more study will be necessary about the equation of adsorption and adsorption phenomena.