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The simulation test for the closed ecology experiment facility is planned by Institute for Environmental Sciences(IES) of Japan. The purpose of this test is to confirm that in the closed space, how the ecological factors influence the mass circulating system. The environmental and life support system in IES is based on the same principle as on the earth where the carbon dioxide produced by the respiration of human and animals is reduced to oxygen by the photosynthesis of the plants, but as an auxiliary system, artificial carbon dioxide reduction system is planned to be attached. This report describes about the loop test for the reduction of carbon dioxide using the Sabatier method: the reduction of carbon dioxide using hydrogen, the decomposition of produced methane and the water electrolysis. (See Figure 1)