Hydrogen was prepared from water by redox cycle using metal catalyst supported on activated carbon. Metal catalysts used were Co and Ni, and they were supported on the activated carbon which functioned as reactant. Reaction was carried out at 600-800℃ introducing water continuously into the fixed bed type reactor. Na₂CO₃, well-known catalyst for coal-gasification reaction, was also tested at the same conditions to compare its catalytic performance with Co and Ni. As a result, Na₂CO₃ was the best catalyst among the used at 800℃. At 700℃, all catalysts used showed similar H₂ production rate. However, Co and Ni showed better H₂ production rate then Na₂CO₃ at 600℃. From these results, Co and Ni were proved good catalysts for H₂ production at low temperature(600℃) in case of continuous feeding of water.