Abstract: It was studied by XPS that the surface hydrolysis product LiOH of the conserved LiH reacted in sealed dry condition at the room temperature. The results show that LiOH reacts with bulk LiH to form Li₂O by the solid diffusion with the release of H₂. The reaction results in the producing of bubbling and separation of the organic coating and LiH during its dry conservation. It is found that some conserved samples are in good form without these problems because most of LiOH in the hydrolysis layer reacted with ambient CO₂ and transformed to Li₂CO₃ before surface coated with polymer. So, using CO₂ as protecting gas can make LiOH transform to Li₂CO₃. It is an effective way while machining LiH and it will be greatly attributed to preserving the materials.