In　this　research,　three　commonly　used　coagulants　(FeCl3,　PAC　and　Al2(SO4)3)　and　hydroxyl　iron　particle　adsorbent　were　used　to　remove　phosphorus　from　the　secondary　effluent　of　a　municipal　treatment　plant.　Based　on　the　analysis　of　the　speciation　and　concentration　of　phosphorus,　the　removal　effects　of　different　phosphorus　forms　and　technical　economy　of　the　coagulation　and　adsorption　methods　were　discussed　under　the　same　water　quality　and　environmental　conditions.　The　results　showed　that　the　average　TP　concentration　in　the　secondary　effluent　of　this　plant　was　0.332　mg•L-1.　The　soluble　active　phosphate　was　the　main　form,　accounting　for　64.16%　of　TP.　Compared　with　FeCl3,　Al2(SO4)3　and　PAC　were　two　suitable　coagulants　for　TP　removal,　and　TP　concentration　in　effluent　lowered　to　below　0.05　mg•L-1　at　Al2(SO4)3　or　PAC　dosage　of　3　mg•L-1.　Additionally,　the　removal　efficiency　of　particulate　phosphorus　and　other　soluble　phosphorus　was　relatively　inferior　to　that　of　soluble　reactive　phosphate,　the　later　could　be　completely　removed　by　Al2(SO4)3　or　PAC　coagulation.　Through　the　analysis　of　technical　economy　of　TP　removal　system,　Al2(SO4)3　was　selected　as　the　best　coagulant.　Besides,　the　adsorption　effect　of　hydroxyl　iron　adsorbent　on　soluble　reactive　phosphate　was　significant,　while　on　other　soluble　phosphorus　was　relatively　poor.　The　TP　concentration　in　effluent　was　below　0.05　mg•L-1　when　the　empty　bed　contact　time　(EBCT)　was　longer　than　10　min.　In　view　of　long-term　economic　benefits,　the　performance　of　adsorbent　was　better　than　that　of　coagulant.　©　2019,　Science　Press.　All　right　reserved.