We　investigate　the　generation　of　a　multibody　Dicke　state　in　a　coupled　cavity　system　subject　to　environmental　noise.　Based　on　quantum　feedback　control,　cavity　decay　may　play　a　constructive　role　in　obtaining　the　intended　state.　The　required　interaction　time　need　not　be　accurately　controlled.　In　addition,　the　feedback　operations　are　only　applied　to　a　single　atom　in　one　cavity　during　the　whole　evolution　process,　and　it　is　not　necessary　to　change　the　control　strategy　as　the　number　of　atoms　increases.　Thus,　our　proposal　can　exploit　the　core　advantage　of　coupled　cavities　to　implement　a　scalable　control　scheme　for　preparing　multibody　entanglement.