The　micro-polluted　river　water　was　treated　by　using　integrated　horizontal-flow　constructed　wetland.　The　micropolluted　river　water　was　mixed　up　by　effluent　from　wastewater　treatment　plant　in　west　of　Changchun　City　and　Leijia　river　water.　The　experimental　study　hydraulic　retention　time　(HRT)　and　temperature　on　the　impact　of　wetland　characteristics.　The　experimental　results　show　that　HRT　on　the　wetland　effluent　COD,　total　phosphorus　and　nitrate　nitrogen　had　significant　effects,　but　it　on　the　ammonia　and　nitrite　was　less　affected.　In　this　study,　HRT　is　best　when　the　treatment　was　the　best　around　1.29d.　At　this　time,　COD　removal　rate　was　about　50%,　TP　removal　efficiency　was　80%　to　90%,　and　nitrate　nitrogen　removal　rate　was　70%;　Temperature　on　the　impact　of　wetland　effluent　COD　was　significant　,but　on　ammonia　nitrogen,　nitrate　nitrogen,　total　phosphorus,　and　nitrite　was　less　affected.　When　the　temperature　was　less　than　10　°C,　COD　removal　efficiency　was　only　about　40%.When　temperature　rised　up,　COD　removal　rate　was　increased,　up　to　65%.　©　2011　IEEE.