We investigated the reduction of TiO(2) in the presence of Ni by nonequilibrium hydrogen gas, including low-temperature hydrogen plasma at 800 degrees C and supercooled monatomic hydrogen at 1000 degrees C. TiO(2) was reduced to TiO(2)O(3), which is not in equilibrium phase, by low-temperature hydrogen plasma. The results of x-ray diffraction and energy dispersive x-ray analysis in experiments at 1000 degrees C indicate that the thermodynamical reduction potential of supercooled monatomic hydrogen is almost the same as atmospheric hydrogen gas. However, the wide Ti(3)O(5) layer formed only in the case of the reduction at 1000 degrees C by supercooled monatomic hydrogen. With these experimental facts. we speculate that the reduction mechanism by nonequilibrium hydrogen consists of two steps; the releasing energy process and the relaxation process. We can explain the difference of reduction products by nonequilibrium hydrogen gas oil the assumption of the rate of the relaxation process between 800 and 1000 degrees C.