To　solve　the　problem　that　the　backwashing　iron　residuals　in　the　iron　and　manganese　removal　are　difficult　to　collect　after　adsorption　as　As　removal　adsorbent,　solvothermal　method　was　used　to　prepare　a　magnetic　powder　adsorbent　(MPA).　Its　adsorption　performances　were　studied　and　its　adsorption　mechanism　for　As(V)　was　investigated　and　cleared　up　by　FTIR.　In　addition,　optimum　regeneration　conditions　of　saturated　MPA　and　performances　of　regenerated　MPA　were　studied.　The　results　show　that　the　maximum　adsorption　capacity　of　MPA　for　As(V)　calculated　by　Langmuir　isotherm　equation　at　25,　35　and　45　are　8.694,　10.005　and　13.400　mg/g,　respectively.　Specific　adsorption　occurs　and　MPA　forms　stable　inner　complex　with　As(V).　Under　extreme　alkaline　conditions,　the　adsorbed　arsenic　can　be　easily　desorbed　from　MPA.　The　optimal　mass　fraction　is　1%　using　NaOH　as　regenerating　solution,　and　the　best　temperature　for　desorption　is　55.　The　adsorption　rate　of　MPA　after　regeneration　becomes　faster,　but　the　adsorption　capacity　decreases.　After　three　regeneration　cycles,　the　final　adsorption　capacity　maintains　71.1%　of　the　initial　value.　MPA　can　be　reused　for　many　times,　and　moreover,　the　exhausted　adsorbent　can　meet　the　requirements　of　landfill　without　any　other　treatment.　©　2019,　Central　South　University　Press.　All　right　reserved.