Selenium　can　regulate　arsenic　toxicity　by　strengthening　antioxidant　potential,　but　the　antagonism　between　selenite　or　selenate　nutrient　and　the　translocation　of　arsenic　species　from　paddy　soil　to　different　rice　organs　are　poorly　understood.　In　this　study,　a　pot　experiment　was　designed　to　investigate　the　effect　of　selenite　or　selenate　on　arsenite　or　arsenate　toxicity　to　two　indica　rice　cultivars　(namely　Ming　Hui　63　and　Lu　You　Ming　Zhan),　and　the　uptake　and　transportation　of　arsenic　species　from　paddy　soil　to　different　rice　organs.　The　results　showed　that　selenite　or　selenate　could　significantly　decrease　the　arsenate　concentration　in　pore　water　of　soils,　and　thus　inhibited　arsenate　uptake　by　rice　roots.　However,　the　existence　of　selenite　or　selenate　didn＇t　decrease　arsenate　concentration　in　rhizosphere　pore　water　of　two　indica　rice　cultivars.　There　existed　good　antagonistic　effect　between　selenite　or　selenate　and　the　uptake　of　arsenite　and　arsenate　in　rice　plant　in　the　case　of　low　arsenic　paddy　soil.　However,　this　antagonism　depended　on　rice　cultivars,　arsenic　species　and　arsenic　level　in　soil.　There　existed　both　synergistic　and　inhibiting　effects　between　the　addition　of　selenite　or　selenate　and　the　uptake　of　trimethylarsinoxide　and　dimethylarsinic　acid　by　two　indica　rice　cultivars,　but　the　mechanism　was　unclear.　Both　selenite　and　selenate　are　all　effective　to　decrease　the　translocation　of　inorganic　arsenic　from　the　roots　to　their　above-ground　rice　organs　in　arsenite/arsenate-spiked　paddy　soil,　but　selenate　had　stronger　inhibiting　effect　on　their　transfer　factors　than　selenite.　(C)　2019　Elsevier　Ltd.　All　rights　reserved.