Lithium deuteride is a compound of deuterium and hydrogen, isotopes of lithium, with a high melting and boiling point. It is colorless crystal or white powdery solid at room temperature and pressure. It is formed by the reaction of molten metal Li with deuterium gas and is a stable compound that can be transported and stored. Lithium deuteride has unique properties such as low density and low atomic number, and can be used as low energy X-ray scattering and transport materials, light neutron moderators, etc., which has important research and application value in the field of astronomy research and nuclear effect testing. Lithium deuteride decomposes in water to produce deuterium gas and lithium hydroxide, which react with some acids. It can be used as a solvent and hydrogen storage material in nuclear magnetic resonance (NMR), and can also be used as a catalyst, catalytic hydrogenation reaction and organic synthesis.