The　quality　security　technology　of　reclaimed　water　reuse　is　studied　in　Northwest　Ecological　Economic　zone　of　Changchun　City.　Based　on　the　study,　＇Four　Methods＇　series　water　treatment　process　is　proposed,　which　is　centralized　sewage　treatment　plant,　new　technology　process　on　pan-oxidation　pond,　ecology　of　rivers　and　lakes,　intensive　wetlands.　A　stepped　reclaimed　water　reuse　control　system　is　formed　on　urban　wastewater　collection　and　treatment　from　the　source　of　sewage,　channel　pan-oxidation　pond　biological　treatment　in　the　central,　river　ecology　treatment　in　the　lower　and　purify　water　by　wetlands　in　end.　The　results　show　that　Four　Methods　series　water　treatment　process　in　Changchun　can　be　applied　on　Changchun　city　sewage　treatment　plant　effluent　and　river　water　after　the　point　source　pollution.　The　effluent　targets　achieved　or　exceeded　the　surface　water　class,　standard.　It　can　be　reused　for　agricultural　irrigation,　fisheries,　water　and　wetlands　replenishment　The　results　will　protect　an　important　guarantee　for　the　project　in　Changchun　City　for　the　use　of　recycled　water　quality.　©　2011　IEEE.