The　P300　Speller　is　a　kind　of　Brain-Computer　Interface　through　which　a　person　can　input　characters　to　a　computer　just　by　adjusting　his　own　attention.　The　P300　Speller　can　service　special　people,　but　its　capability　of　communication　is　expected　to　be　enhanced.　In　this　paper,　we　propose　a　method　to　implement　a　system,　Brain-Controlled　Speech　Generator　(BCSG),　which　can　say　a　sentence　after　a　person　briefly　describes　it　by　a　P300　Speller.　BCSG　is　composed　of　a　sentence　speller,　a　sentence　corrector,　and　a　sound　producer.　The　sentence　speller　is　based　on　a　P300　Speller.　The　sentence　corrector　restores　a　sentence　when　a　person　omits　some　trivial　characters　or　makes　some　mistakes　during　his　spelling.　The　sound　producer　speaks　out　the　sentence.　We　implemented　the　BCSG　and　our　experiments　showed　that　our　BCSG　could　say　the　sentences　in　time　after　the　subjects　express　them　by　paying　attention　to　the　different　stimuli　presented　by　the　BCSG.　The　BCSG　is　a　new　communication　approach　for　some　special　situations.