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Magnified preparation of the catalyst was studied in this paper. Activity and stability of the catalyst were evaluated through long period, and deactivation mechanism of the catalyst was studied. The study result showed that average conversion of CO and H2 reached 99. 9% and 9.8% respectively, average selectivity of CH4 attained 98. 5%, and the activity of application catalyst was stable after continuous running of 1 000 hours. Deactivation mechanism study of the catalyst showed that the causes of catalyst deactivation with long period operation were carbon deposition and sintering, in which sintering is the main factor resulting in the decrease of catalyst activity. [ABSTRACT FROM AUTHOR]