Hydrogen absorption experiments were carried out by the titanium(Ti) for investigating the characteristics of hydrogen absorption, and the reactivity of these hydrides in air at elevated temperature was also investigated. From experimental results, Ti sponges showed the high hydrogen absorption capacity in spite of low reaction temperature of 25 ℃. When a temperature increased up to 800 ℃, Ti sponge(TiH2) showed slow oxidation in air. The effects of the reaction temperature, activation conditions, and the presence of helium in the hydrogen were investigated.