Single-crystalline　La0.6Sr0.4MnO3+delta　micro-cubes　of　cubic　perovskite　phase　were　prepared　hydrothermally.　The　adopted　temperature　and　time　of　hydrothermal　treatment　and　the　amount　of　KOH　used　had　great　effects　on　the　low-temperature　reducibility　of　La0.6Sr0.4MnO3+delta.　The　initial　H-2　consumption　rate　of　La0.6Sr0.4MnO3+delta　played　a　vital　role　in　determining　its　catalytic　activity　for　toluene　combustion.　It　is　concluded　that　the　perovskite-type　oxide　catalyst　with　a　higher　initial　H-2　consumption　rate　displayed　a　higher　catalytic　activity　for　the　addressed　reaction.