Both　active　species　and　morphological　effect　are　important　for　antimonate　photocatalysis.　However,　there　is　little　research　on　the　relationship　between　them.　The　aims　of　this　article　are　to　investigate　the　relationship　between　morphological　effect　and　mutual　transformation　of　active　species　during　photocatalytic　degradation　of　Rhodamine　B　(RhB)　over　BaSb2O6.　The　existence　of　active　species　is　confirmed　by　electron　spin-resonance　spectroscopy　(ESR),　photoluminescence　method　and　N,N-diethyl-p-phenylenediamine　(DPD)　method.　The　role　of　active　species　is　evaluated　by　adding　scavengers　of　active　species　during　the　photocatalytic　degradation　of　RhB,　and　the　mutual　transformation　of　active　species　are　investigated　by　observing　the　influence　of　different　conditions　on　H2O2　in　the　photocatalytic　processes.　The　results　show　that　the　concentration　of　(OH)-O-center　dot　has　the　greatest　influence　on　photocatalytic　activity　of　BaSb2O6.　As　the　sources　of　(OH)-O-center　dot,　the　production　of　HO2　center　dot/O-2(center　dot-)　and　surface　hydroxyl　groups　are　dependent　on　the　morphology　of　the　sample.　The　concentrations　of　HO2　center　dot/O-2(center　dot-)　and　surface　hydroxyl　groups　are　higher　on　marigold-flower-like　BaSb2O6　than　that　on　rose-flower-like　BaSb2O6.　The　morphological　effect　of　BaSb2O6　may　be　applied　similarly　to　other　antimonate　photocatalysts.　(C)　2014　Elsevier　B.V.　All　rights　reserved.