Abstract: Behaviors of deuterium absorption and desorption of LaNi 4 7 Al 0 3 are investigated.Absorption capacity,gas retaining,isotherm curves,and relationships between desorption equilibrium pressure and temperature are given.The basic thermodynamic parameters,Δ H and Δ S are also given. This provides the theoretic basis for application of LaNi 4 7 Al 0 3.