The　thermal　decomposition　properties　of　Ca(BH4)(2)/LiNH2　system　were　investigated.　It　was　found　that　the　mixtures　started　to　release　hydrogen　at　around　250　degrees　C,　but　accompanied　emission　of　ammonia　at　lower　temperature　was　also　occurred.　XRD　results　revealed　that,　after　a　shot　time　of　ball　mining,　the　Ca(BH4)(2)/LiNH2　mixtures　transferred　to　unidentified　new　phases　and　the　decomposed　product　mainly　consists　of　LiCa4(　BN2)(3).　Further　improvement　on　restraining　the　ammonia　release　can　be　achieved　by　heating　treatment　of　this　composite　or　addition　of　LiH　to　the　binary　system.　(C)　2010　Elsevier　B.V.　All　rights　reserved.