Three Copper containing mordenites such as ion-exchanged （CuHM）, impregnated (Cu/HM#) and mechanically mixed mordenite with cupric oxide (Cu//HM#) were studied to understand the behavior of copper in these mordenites when redox-treating under the carbon monoxide or hydrogen as reducing agent and oxygen as oxidizing one. It was found that loaded cupric ions containing in decationized, dealuminated and repeatedly thermal treated hydrogen mordenite (HM#) were more readily reduced than simply decationized one (HM). When redox-repeating, the copper metal and cupric oxide on CuHM, Cu/HM# and Cu//HM# easily formed and diffused readily in direction of either internal or external surface of the mordenite crystal, but most of them were distributed on external surface of the zeolite crystal.