Interface　performance,　charge　property　and　structure　topography　of　iron-manganese　oxide　(FeMnO)　are　studied.　Pollution　removal　mechanism　of　the　FeMnO　are　approached.　Results　show　that　main　compositions　of　the　FeMnO　are　δ-manganese　dioxide　and　ferric　hydroxide.　The　FeMnO　contains　with　rich　hydroxyl.　The　specific　surface　area　is　reached　to　146.22m2/g.　Zero　charge　point　of　the　oxide　in　pure　water　is　about　8.0　of　pH　value.　The　FeMnO　particles　are　quasi-spherical　micro-particles　with　irregular　sizes　adjoined　to　form　net　construction　each　other.　Removal　rates　of　turbidity,　TOC　and　UV254　of　filtered　water　are　reached　to　99.99%,　42.25%　and　68.91%　respectively,　after　FeMnO　coagulation.　The　mechanism　of　turbidity　and　organic　matter　removal　by　coagulation　is　combined　results　of　multiple　actions　of　adsorption,　charge　neutralization,　adsorption/bridging　and　so　on.