The　cycle　stability　of　La-Mg-Ni　based　alloys　in　a　gas　solid　reaction　system　was　investigated　in　this　work.　Both　partial　substitutions　of　La　and　Ni　by　Ce　and　Al,　respectively,　improved　the　cycle　stability　of　La(0.6-x)CexCa1.03Mg1.32Ni(9-y)Aly　alloys.　Although　the　addition　of　Al　reduced　the　hydrogen　storage　capacity　significantly,　it　is　still　important　to　be　included　in　the　system　for　its　superior　property　in　improving　the　cycle　life.　Hence,　two　optimized　samples　with　a　small　addition　of　Al　(y　=　0.10)　were　used　to　compare　with　the　cycle　life　of　CaNi5　It　was　found　that　the　Ce　and　Al　added　samples　have　a　better　hydrogen　capacity　retention　than　that　of　samples　without　element　substitution;　and　their　overall　hydrogen　storage　capacity　was　still　higher　than　that　of　CaNis.　We　also　found　that　heat　treatment　used　in　this　study　did　not　fully　recover　the　hydrogen　storage　capability　of　La-Mg-Ni　based　alloy　to　its　original　storage　capacity.　A　probable　reason　was　the　heat　treatment　used　in　this　study　could　only　recover　the　degradation　caused　by　the　disproportionation　to　some　extent,　but　the　treatment　was　unable　to　reverse　the　degradation　caused　by　decrepitation.　(C)　2017　Hydrogen　Energy　Publications　LLC.　Published　by　Elsevier　Ltd.　All　rights　reserved.