The adsorption and desorption properties of water and breakthrough curves of dichlorodifluoromethane-water system were measured on zeolite NaA, CaA, and activated alumina to see the adsorption characteristics, which are effective for the separation of water from dichlorodifluoromethane-water mixture gas. The adsorption isotherms at low equilibrium pressure and the temperature programmed desorption curves of water were measured by gas chromatography. The separation of water from dichlorodifluoromethane on molecular sieving zeolite A has been found to be more effective than on activated alumina by comparing breakthrough curves which were determined from the measured isotherms. It may be ascertained that NaA is the most effective adsorbent from a standpoint of the regeneration by desorption process, although CaA adsorbs water more than NaA.