Although　the　removal　of　arsenic　from　water　using　chitosan-WTRs　adsorbent　made　by　the　embedding　method　has　been　extensively　studied,　the　adsorption　capacity　is　significantly　lower　than　that　of　origin　WTRs.　In　this　paper,　the　WTRs-chitosan　beads　made　by　homogeneous　method　(WCB)　were　used　as　effective　As(III)　adsorbents.　In　order　to　obtain　a　better　oxidation　ability,　MnO2　was　added　to　WCB　to　make　Mn-WCB,　which　was　compared　with　WCB　through　various　experiments　to　verify　the　optimization　effect.　Both　adsorbents　have　carried　out　a　variety　of　characterization　and　adsorption　efficiency　experiments.　The　physicochemical　properties　and　adsorption　capacities　of　WCB　and　Mn-WCB　were　compared,　and　the　adsorption　mechanism　of　Mn-WCB　was　analyzed.　Under　neutral　conditions,　the　maximum　adsorption　capacity　estimated　according　to　the　Langmuir　isotherm　model　were　28.607　mg/g　and　36.911　mg/g,　respectively.　By　comparison,　adding　manganese　dioxide　to　WCB　can　effectively　increase　the　adsorption　capacity　and　enhance　the　regeneration　performance,　also　the　pore　structure　and　acid　resistance　have　been　improved.　The　experimental　results　proved　that　both　WCB　and　Mn-WCB　are　good　As(III)　adsorbents,　and　Mn-WCB　was　obviously　better　than　WCB　in　terms　of　adsorption　capacity　and　structure,　indicating　that　the　addition　of　MnO2　in　WTR-chitosan　beads　is　an　effective　optimization　method　for　As(III)　removal.